Trend23

This "vintage" photo shows Britney Spears' flaunting her tight tummy.

Trend22

Bare That Midriff: Brooke Hogan leaves the gym, showing off her midriff.

Trend21

Bare That Midriff: Gwen Stefani (who has had two children) rocks a flat stomach on and off stage.

Trend20

Bare That Midriff: Christina Aguilera was a dirty girl baring one flat stomach.

Trend19

Bare That Midriff: Kat Von D arrives at the Teen Choice Awards 2009 leaving little more than tattoos to "cover up" her midriff.

Trend18

Short shorts or no pants: Lady Gaga visits BET's '106 & Park' in New York City wearing fishnets as pants.

Trend17

Short shorts or no pants: Miley Cyrus performs during her 'Wonder World' tour in short shorts.

Trend16

Short shorts or no pants: Katy Perry poses during the 2009 MTV Europe Music Awards in cute little shorts.

Trend15

Short shorts or no pants: Rihanna performs during the German TV Show 'Popstars You & I' final wearing just a body suit and boots.

Trend14

Is it the '60s? Nicole Richie visits Starbucks wearing bell-bottoms and big sunglasses.

Trend14

Is it the '60s? Nicole Richie visits Starbucks wearing bell-bottoms and big sunglasses.

Trend13

Lindsay Lohan stops at McDonald's restaurant in Hollywood wearing a flowing Boho inspired dress.

Trend12

Kate Hudson throws together her Boho look while out in Santa Monica.

Trend11

Boho: Mischa Barton enters the Gramercy hotel in Midtown Manhattan wearing a Boho chic look.

Trend10

Boho: Mary-Kate arrive at the Valli party during Paris fashion week in a long flowing Boho dress that hides her tiny figure.

Trend09

Pamela Anderson throws on UGGs and sweatpants to go grocery shopping in Malibu.

Trend08

Jessica Simpson shops near her home in her sweatpants and UGGs.

Trend07

Ashley Tisdale went casual chic with UGG boots while out with her 'High School Musical' co-star, Zac Efron.

Trend06

Sarah Jessica Parker throws on sweatpants and UGGs while on set.

Trend05

Juicy Couture Tracksuits & UGG Boots: Kate Hudson wears her Juicy jumpsuit to "Gold's Gym" in Hollywood, CA.

Trend04

Ashlee Simpson-Wentz wears a hat and all black, which is her usual hipster style.

Trend03

Michelle Williams channels her inner hipster while out in Brooklyn with her daughter.

Trend02

Kristen Stewart is usually wearing skinny jeans, rock band t-shirts and jet-black hair.

Trend01

Samantha Ronson wears skinny jeans, high-top shoes and a fedora.