Are you ready for another designer dress duel? This go-round, Paris Hilton takes on Rihanna.

First up, the heiress. Paris popped an awkward pose outside of Dave Letterman's NYC studio in the wonderful Alexander Wang corset dress. The party girl paired her frock with black YSL "Trib Two" heels, a couple of rings, and a fabulous black and gold resin necklace from Nicole Richie's House of Harlow jewelry line.

Rihanna, on the other hand, was caught leaving Kanye West's apartment in the very same dress one week before Paris paraded around in it. The hitmaker opted to enhance her $800 ensemble with sophisticated earrings, an Erva "Razza" tote, and stylish Jill Sander pumps.

We have another close call on our hands! I typically love Rihanna's looks, but I have to give Paris props; the girl knows how to dress. (I mean, it's what she does for a living!) Rihanna's bag is beyond beautiful, but Paris' necklace just makes her dress pop. And, as a result, she wins.

What do you think?

From Lady Gaga's futuristic getups to Mary-Kate Olsen's boho-chic ensembles, this season it's all about emulating some of Hollywood's most fashionable females. Luckily, this episode of "The Thread" will show you how to construct similar outfits and where to pick up some super cute items ... that cost next to nothing! So, tune in, and let us know whose style you might snag this summer!

Own the Catwalk With These Dress Up Games on Yahoo!

Beauties like Megan Fox can still be insecure about their looks. - Jon Kopaloff/FilmMagic.comIt seems that no matter how beautiful a woman is, people have to find a flaw. Right now the Internet is buzzing about Megan Fox's thumbs. Really? The girl could not be more drop-dead gorgeous, and people are taking time out of their busy lives to analyze the size and shape of her thumbs? It's no wonder that women, and female celebrities in particular, obsess about certain body parts or facial features. If we don't do it, it's almost guaranteed that someone else will.

Megan Fox doesn't seem all that concerned about her thumbs from what we can tell, but she did say in a recent interview that she is extremely insecure about her looks. She even joked (we hope!) about thinking she's an Alan Alda lookalike. And while we think Alan is adorable, Megan clearly wins out in the attractiveness department.

We also contend that some people's "flaws" are actually what makes them alluring, like Julia Roberts' wide, contagious smile. So we present a list of gorgeous celebrities who have criticized

Believe it or not, a wool suit can be one of the easiest, most breathable pieces in your closet. Just do like these rising comedy stars and buy a lightweight one -- the kind that will take you through summer to fall and beyond.

Six Up-and-Coming Comedians Keep It Light for GQ

B.J. Novak in a Boss Black suit with Ralph Lauren Black Label shirt, John Varvatos tie, and Salvatore Ferragamo shoes. - Paola Kudacki/GQB.J. Novak

Age: 29

Credits: NBC's "The Office," Judd Apatow's "Knocked Up," Quentin Tarantino's upcoming "Inglourious Basterds"

On "Basterds" co-star Brad Pitt's sense of humor: "He loved 'Pineapple Express,' but he's a father of six. He could sing the theme song to 'Wonder Pets,' but he didn't know who a lot of current movie stars were. He'd say, 'I love that guy Seth ... Rogen.' There was always a pause. I could see he was trying to make sure he got the name right. It was like, 'That kid Jonas Hill.'

Unlikely comedy mentor: Bob Saget.

On bleaching his hair for "The Office": "I loved it. When I saw Kato Kaelin's hair in eighth grade, I wanted hair like that. I pretended I wanted it ironically. But I thought it

Michelle Pfeiffer talks candidly about aging, plastic surgery, and more in the July issue of InStyle. - Mark Abrahams/InStyleBolder and sexier than ever, 51-year-old Michelle Pfeiffer shoots straight on aging in the July issue of InStyle.

On Turning 50
"Really, the only bad thing about turning 50 was the anticipation. Once you turn 50, you feel grateful you made it. The overriding, positive thing about turning 50, is that you go from 'You don't look your age' to 'You look pretty darn good for your age.' There's this tremendous pressure off -- you deserve to have a wrinkle, you deserve to have a little pooch on your tummy."

On Feeling Sexier Than Ever
"I'm not saying I'm sexier to other people. But part of feeling sexy is feeling comfortable in your own skin, and less inhibited, and that goes along with getting older. Feeling more confident, dropping a lot of the BS."

See How Michelle's Look Has Changed Over the Years

On Getting Plastic Surgery
"Well, I think your face should still move. And you should be recognizable to your friends. One actress I knew years ago, a really lovely person, had some stuff done,

Fergie is bikini ready in the July issue of Allure! - Michael Thompson/AllureStacy "Fergie" Ferguson recently unveiled a new album with the Black Eyed Peas, entitled The E.N.D., as well as a brand new look. At 34, the Dutchess has traded in her blond locks, mini kilts, knee-high socks, and tiaras for a sleek brunette 'do and futuristic fashions. "I'm kind of on this Judy Jetson vibe, but it's more like Judy Jetson after she's traveled the world and become a gypsy," laughs the pop star in Allure's July issue. "Something inside of me said, 'I need an evolution.' I'm in a new phase of life. I'm married; I have a new album. It felt time. I'm not just going to be the booty-shake girl." Hardly.

This spring, Fergie-Ferg debuted a new shoe collection, and recently finished production on the movie musical "Nine," which she had to gain 17 pounds for. Thankfully, her costar, Penelope Cruz, was also ordered to put on some curves. "We were eating our brains out," reveals the "London Bridge" singer. "We ordered everything fried and full of fat and salty!"

While pigging out

Are you ready for another designer dress duel? This time, Disney darling Ashley Tisdale does battle with the feisty 15-year-old star of "True Jackson, VP," Keke Palmer. First up, the "High School Musical" hottie.

Ashley Tisdale - Jason Merritt/Getty ImagesKeke Palmer - Kevin Mazur/WireImage.com

The Tiz rocked the red carpet at the 2009 MTV Movie Awards while wearing a purple leather Elise Overland dress. She paired the fab frock with a sassy belt and strappy Paul & Joe sandals. Her darkened locks also happened to be straightened for the soiree. Miss Palmer, on the other hand, recently donned the same dress while attending Nickelodeon's Kids' Choice Awards back in March. The "Akeelah and the Bee" star also sported purple nail polish, minimal makeup, and black patent pumps.

Another tough one! I prefer Ashley's fierce footwear, and I've been loving her updated 'do, but I also think Keke looked super cute. It's nearly a draw, but I'll go with the Tiz simply because she's been looking better than ever as of late.

What do you think?

Sienna Miller graces the cover of Vogue's July issue. - Craig McDean/VogueSienna Miller has grown up quite a bit since appearing on Vogue's September 2007 cover. The then 25-year-old actress espoused her many self-assured wiles but seemed on the cusp of maturity. "I want to grow up ... I don't want to repeat patterns," she admitted, before adding, "I'm young and I need to have fun!" Now 27, Sienna shudders when she thinks back to the actions of her youth, such as calling Pittsburgh "Shitsburgh" while filming in the city.

"I wanted to be conscious of my actions," she shares in the July 2009 issue of Vogue. "I think I was really naive ... thinking that if you are true to yourself, that's enough, that's the best way to be. But, actually, it's more important to become more conscious."

Although Sienna struggles to shake her reputation as being a party girl, Jude Law's ex, and an indie-flick-only chick, she is ready to go from It girl to hit girl. Not only is she taking on a Hollywood blockbuster -- "G.I. Joe: The Rise of Cobra" -- but she will also be making her