Last night, Paris Hilton took over the rooftop at the Thompson Beverly Hills hotel to launch her latest beauty products, the Celebrity Styler ($64.99) and the Ultimate Brush ($9.99). Everything was pink: the lighting, the spicy tuna rolls, the heiress' dress and, of course, the new styling tools.

The hair-and-beauty collection was designed for the girl-on-the-go. The brush promises quick drying time, while the iron/curler lets you switch up hairstyles in a heartbeat, going from pretty Paris waves to pin-straight Nicky Hilton locks.

Speaking of Nicky, she was right on trend in a striped dress, supporting her sis alongside parents Kathy and Rick, Aunt Kyle Richards and Doug Reinhardt. Also at the bash were Paris' former BFFs from her reality series (guess she didn't really mean TTYN!). While some kept it simple in cute LBDs, others pranced around in ridiculously short skirts and enough embellishment to decorate the Rockefeller Center Christmas tree.

And there was almost as much fur as there was bling. When she wasn't posing for pics, Paris stayed warm in a light gray vest, while other guests went for cropped jackets like this Fabulous Fur one.

Meanwhile, across the country, another star was showing off her love for animal skin with the new Jimmy Choo for H&M zebra clutch. Find out who in mystyle's Soiree Style gallery.

Fans of Michelle Obama know she loves leopard. She friggin' dressed up as the fashion world's fave feline (next to Hello Kitty, of course!) for Halloween.

Yesterday, the first lady wore a fabulous winter-white J.Crew cardigan with sequined spots for the launch of a mentoring program for local high school girls. She wore the same sweater once before, to church. Yes, you read that right! Michelle does not take a break from looking amazing, even on Sundays. 

Like last time, we're wild about how she styled the leopard-print layer: a dusty rose top, brown pinstriped trousers and a beautiful cutout belt. Purr-fection! 

Click over to mystyle's Michelle Obama: Shop Her Style! gallery to get this look and more for less.

Then, learn more about America's modern style icon in the new book Mrs. O: The Face of Fashion Democracy, which features over 120 photographs and interviews with Michelle's go-to designers.

Half of you said you won't even bother braving the lines when H&M's Jimmy Choo collection launches on Saturday, Nov. 14. But does seeing celebrities wearing the clothing and accessories change your mind?

Last night, stars got decked out in Jimmy Choo designer Tamara Mellon's affordable collaboration with H&M. While we adored Paris Hilton's pink clutch ($59.95), we're not sure about the jumpsuit ($69.95). But it probably will look better without those Louboutin booties.

Paris should have worn the new studded sandals ($249) like Olivia Wilde, who made us excited to shop next weekend, with her rhinestone dress ($129) and star clutch ($99). Singer MIA, who performed at the party, totally worked the thigh-high boots ($299); Nicky Hilton looked sleek in a shimmering LBD ($199); and if Hayden Panettiere was taller, maybe she could have pulled off the sequined cardigan ($129) and leather pants ($129). For some reason the petite star reminded us of a grandma from Boca trying to look like she still had her teenage New York style. But that zebra chain purse ($99) is definitely on our wish list!

What do you think of the collection now that you've seen it on celebs? Vote below!

At 11 p.m., Heidi Klum's 10th annual Halloween party presented by MSN and SKYY Vodka was already at capacity. Waiting outside new hot spot Voyeur, I watched Chanel bags, Karl Lagerfelds and more vampires than I could count pass the club on their way to WeHo's famous parade. Finally, the velvet rope opened and I stepped my superhero boots straight to Heidi's table to see if the supermodel outdid her blue deity costume from last year.

On my way to find the new mom, I passed a very cool Rick Fox and Eliza Dushku vampire Bonnie and Clyde and a creative bacon-and-eggs-clad Kelly Osbourne and Luke Worrall. Rachel Zoe was trés chic channeling her inner hippie—OK, not a stretch, but she did look bananas—and TV host Steven 'Cojo' Cojocaru was hilarious as a Khloé Kardashian bride, massive rock and all.

But the prettiest costume at the bash was Paris Hilton's, who did a sexy Swan Lake ballerina while boyfriend Doug Reinhardt hammed it up in a tooth fairy tutu. I actually liked the couple's costumes better than Heidi and Seal's feathered ones. To give Heidi credit, she did just give birth three weeks ago and still managed to throw a Halloween bash rocking thigh-high boots! See what I'm talking about in mystyle's Haute Halloween gallery!

To give Paris Hilton credit, it was extremely windy in Los Angeles last night. So part of us understands her need to secure her dress with safety pins at Michael Jackson's This Is It premiere. And yes, the fastenings are trendier now than they have been since Elizabeth Hurley exposed her body in Versace in 1994.

We don't mind the safety pins holding together the heiress's trendy slashed midsection. But was it really necessary to bring the attention down south with a vertical line of decorative gold? It certainly didn't help Paris avoid a Marilyn Monroe moment in front of her fans.

Keep reading to see more stars braving the weather last night and vote on who would have made M.J. proud with her sense of style...

After a nonstop run of sexy, curve-hugging dresses, it's refreshing to see a celebrity wear something that's plain ol' pretty. Some might argue that Zooey Deschanel was too doll-like at the 13th Annual Hollywood Awards Gala Ceremony, but we think the Luella dress and Martin Lewis for Luella bow heels perfectly fit her sweet, playful style.

Here's how to get the actress's girlie look for less:

Free People's August Ridge dress ($88) has a ballerina quality that reminds us of our childhood dance lessons. Wear it as is, or attach one of Spiegel's silk bow pins ($14 $12) where the black bands cross at the waist.

Keep reading to shop the accessories you need to complete Zooey's look…

TREND: Long-sleeve leopard-print dresses

WHO'S WEARING IT: Paris Hilton, Kim Kardashian, Michelle Trachtenberg

HOW TO WEAR IT: Last summer, we spotted colored leopard print in the form of minis, tops and even gowns. This season, it's all about the long-sleeve dress. Winterize the popular piece with black tights and accessories.

Shop the steal 'n' splurge below!

The most fashionable tweets of the weekend…

Katy Perry got an Oompa Loompa mani for her Willy Wonka birthday bash.

Taylor Swift walked out of Katy's extravaganza with Julianne Hough's initials. Country girls are so adorbs.

Ivanka Trump took a hike and then married publisher fiancé Jared Kushner while channeling Grace Kelly in Vera Wang.

Kim Kardashian taught Jennifer Lopez how to use Twitter while her beau Reggie Bush helped the New Orleans Saints beat J.Lo and Marc Anthony's Miami Dolphins. But there were no hard feelings: Kim got to sex it up with "her idol" later at Liv nightclub in Miami.  

Kim's bestie, Brittny Gastineau, got an early start to the holiday and went to "the bestttttttt halloween party" with "unreal costumes."

Paris Hilton brought out the cleavage but left the sequins in her room to celebrate bf Doug Reinhardt's birthday in Las Vegas.

And the NYC rain prevented Alicia Keys from wearing these fierce fringe boots. Sad.

The minute I walked into Sanrio's Hello Kitty 35th Anniversary Party at Royal/T in I thought, wow, queen of kitty bling Kimora Lee Simmons would love this. Sure enough, Miss Fabulous herself was inside with daughters Ming and Aoki taking pictures wearing red Hello Kitty bows.

Fellow Hello Kitty lover Paris Hilton was happy to show of her kitty jewels, including these Tarina Tarantino earrings ($88)—but surprisingly, the heiress was one of the tamest attendees at the bash.

The 10,000-square-foot space in Culver City was full of artists' interpretations of Hello Kitty on the walls, ranging from traditional canvases to photographs of kitty-fied Lady Gaga. There were displays of Hello Kitty jewelry and fashion, including the bustier Katy Perry wore earlier this year. But my favorite part of the event was people-watching. The tutu-clad, wigged-out, bedazzled guests would make even Gwen Stefani's harajuku girls proud.

Click below to see more stars at fashionable fetes in mystyle's Soiree Style gallery!

Hot pink is one of the hottest colors for fall—and the trend is continuing into next spring. So it's no surprise that stars have been showing up in all different versions of Barbie's fave shade. Unfortunately, you can't always be pretty in pink. Case in point: This weekend, celebs competed around the globe to see who could wear the color worst. Paris Hilton went for extra-padded pink in New York; Rose McGowan thought she was in a beauty pageant at the Rome International Film Festival; Phoebe Price showed just how unfashionable she could be at L.A. Fashion Week; and Lily Allen stopped traffic in London.

Considering Lily's coat looks like it was stolen from a KKK member and then dipped in Pepto-Bismol, the singer wins worst-dressed from us. But what do you think? Vote below!

Paris Hilton and Katie Cassidy were both caught wearing the same dress. Cue the obligatory "Oh, no she didn't!" Tell us who you think looked better in mystyle's new fun Style Showdown gallery.

Stars are heating up their cold-weather-chic outfits with leopard-print ankle boots. Shop this fierce spotted bootie for under 35 bucks!

Pamela Anderson makes a little girl carry the train of her fugly dress. WTF? The bigger question is, "What was that poor child thinking?"

On our Shop-It List this week? These pyramid-studded metallic headbands. They're only $6. 'Nuff said!

Last night, I attended the Madison & Diavolina launch party in Los Angeles hosted by Current/Elliott designers Meritt Elliott and Emily Current. It was a chance to do some feel-good shopping (a portion of the evening's sales went to Susan G. Komen for the Cure). But the real reason I stopped by was to see my girl crush Mandy Moore.

The singer showed up wearing a pumpkin-orange Isabel Marant printed dress and black cutout Miu Miu heels. Cute! "I didn't put much thought into it," the California casual fashionista said of her outfit. She did, however, have fall fashion on the brain. "I've got my eye on the fall accessories. I'm a big scarf girl."

After our brief but amazing conversation (she's so sweet!), I thought I would be stalking Mandy's every move. Instead, I found myself marveling at two unexpected style mavens the rest of the night.

When we saw Paris Hilton at Fox Reality Channel's Really Awards, we knew we had seen her sparkly Brian Lichtenberg dress before...on Katie Cassidy this summer. The younger blonde totally beats the heiress in the styling department for the simple fact that she did not attempt a pompadour that only works on Gwen Stefani, Rihanna and John Travolta.  

Who do you think styled the one-shoulder dress better? Vote now in mystyle's new Style Showdown: Who Scores? gallery!

We felt slightly bad for Lindsay Lohan getting slammed in the reviews department for her failed attempt to inject fashionable youth into Emmanuel Ungaro's spring line. But our sympathy instantly vanished when we saw LiLo sporting sequined headgear with a cutesy bow. Just because you're partying in Paris does not mean you have to accessorize like Paris Hilton.

Click below to see the actual heiress dancing in her signature headband—as well as more fashionable feting stars—in mystyle's Style Soiree gallery.

TREND: Bright Lips

WHO'S WEARING IT: Keep reading to find out!

HOW TO WEAR IT: Painting your pout bright coral, pink or orange is the perfect way to celebrate these last weeks of summer. Bobbi Brown Education Executive Diana Changanaqui recommends keeping it really clean on the eye when wearing a bright lip. Try a nude shadow with mascara or really thin eyeliner. And just like with a bold dress or statement jewelry, Diana advises to "find a color that you wear, not one that wears you."

Pucker up with the steals 'n' splurges in the gallery below!