PHOTOS: Stars In The Best & Worst Fashions Of The Day

1. WORST: Olivia Munn looked hippie dippy on the streets of NYC.

2. WORST: Lady Gaga was dressed to shock in a Thierry Mugler catsuit at Paris Fashion Week, leaving little to the imagination.

3. BEST: Blake Lively looked white hot in a Chanel Haute Couture frock and Christian Louboutin ballet inspired pumps to a Chanel dinner in NYC.

4. WORST: Fishnet tights were not a complimentary addition to Vanessa Hudgens ensemble after the Late Show with David Letterman.

5. WORST: Debbie Gibson flashed back to her Electric Youth days at the Los Angeles premiere of Take Me Home Tonight.

6. BEST: Michelle Trachtenberg looked tres glam in a short and sexy Marchesa mini at the Los Angeles premiere of Take Me Home Tonight.

7. BEST: Anna Faris looked red hot in a body con Donna Karan mini at the Los Angeles premiere of Take Me Home Tonight, finishing off her look with Brian Atwood Helena Platforms.

8. WORST: Teresa Palmer looked more amateur than awesome at the Los Angeles premiere of Take Me Home Tonight, wearing a Pepto pink Christopher Kane lace dress, which featured a plastic halter neck.

9. WORST: Jodie Sweetin hit the Los Angeles premiere of Take Me Home Tonight, wearing a teeny tiny mini dress with 1980’s accessories.

10. BEST: Karolina Kurkova showed off her supermodel bod at a private Dior dinner in Madrid.

11. WORST: Miranda Kerr experienced a fashion flop at Paris Fashion Week, wearing clunky shoes with a teeny tiny mini skirt.

12. BEST: Jamie King was dressed to thrill at the Los Angeles premiere of Take Me Home Tonight, wearing a tres sexy Burberry Prorsum dress, which featured a cutout back.

13. BEST: Malin Akerman looked chic on the streets of NYC, rocking black booties with a chain embellished mini dress.

14. WORST: Nicole Richie wasn’t exactly incognito at the airport wearing a leopard print coat.

15. WORST: Paris Hilton took the boho look a little too far, hitting the nail salon with hippie headgear.

16. WORST: Sarah Silverman was in sloppy style for lunch in Los Angeles.

17. BEST: Only Camila Alves could throw on a Dr. Suess hat with designer duds and look smoking hot! The Brazilian babe attended the National Education Association's Read Across America Day to celebrate Dr. Seuss's 107th Birthday at the Library of Congress, wearing a white-hot cap-sleeved dress with pastel yellow pumps.

18. BEST: Only Rihanna could pull off this belly baring Alexander Wang ensemble. The sassy singer finished off the look with studded Christian Louboutin heels, for a sexy Sydney look!

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19. BEST: Reese Witherspoon looked casually chic, rocking a navy peacoat with her fave Golden Goose boots in Los Angeles.

20. BEST: Audrina Patridge was a Badgley Mischka babe at the designer’s flagship store opening in Beverly Hills.

21. WORST: Rumer Willis’ sparkling Badgley Mischka gown clashed with her orange hair at the brand’s Rodeo Drive flagship store opening.

22. BEST: Rosie Huntington-Whiteley was a leather lady, leaving Joan’s On Third with her action hero beau Jason Statham.

23. BEST: Kate Winslet showed off her gorgeous curves in black at the Vogue Party in Paris.