The Years Biggest Transformation

1. Lindsay Lohan

From Super Skinny

Lindsay Lohan started off the year with a frame that was becoming frighteningly frail. Her wild partying got her into hot water with her boss while filming Georgia Rule and with costars on the Bobby set, and her hair went from platinum blonde to this brassy bronze shade.

...To Cleaned-Up Cutie

Now Lindsay's looks like she's made a serious effort to get healthy for good. She has added some much-needed pounds to her formerly skeletal shape, and joined AA to help her ditch her drinking.

2.) Avril Lavigne

From Frumpy Punk...

Punk-princess Avril Lavigne never seemed like much of a fashion fan, usually opting for comfort over couture.

...To Glamour Goddess

Looks like married life did wonders for Avril's sense of style. Ever since that fabulously glam shoot for Harper's Bazaar in Jan., she's been spotted in designer duds and flawless make up.

3.) Britney Spears

From Busty Brunette...

When Britney Spears presented her then-husband Kevin Federline's first live performance at the Teen Choice Awards, she was ready to bust--not only out of her dress--but also weeks away from delivering the pair's second baby boy, Jayden James.

...To Barely-There Blonde

Since dumping Kevin in Nov., Britney has gone a little crazy celebrating her freedom by showing off her new, baby fat-free body and teeny tiny outfits that finally fit again.