Hair's the Scoop

Source: Bruce Gifford/FilmMagic

Out with the old, in with the new! Ashlee Simpson rang in 2009 as a blonde.

Source: Johnny Nunez/WireImage

R&B singer Estelle debuted a longer, softer look whilst out celebrating with Kelis in NYC.

Source: Splash News

This not-so-Desperate Housewife proves that the right shade of red can illuminate and define.

Source: ACL/London Ent/Splash, J.Mitchell/Splash

Gossip Girl's Jessica Szohr proves that playing with your hair texture can yield as dramatic a result as changing your color. One day Jessica's voluminous and straight, and another she's perfectly coiled. With each style having its own unique appeal and overall effect.

I personally prefer Jessica with curly hair, but at a length closer to the shot on the left. The playfulness of the look compliments her bright eyes and big smile. But which look do you like best? Weigh in below.

Check out how other stars switch hairstyles.

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Abbie Cornish allowed her (gorgeous) diamond drop earrings to take center stage with a sleek, ballerina-like chignon.

Source: Janet Mayer/Splash News

Cameron Diaz attended the "Shrek The Musical" Broadway opening sans her signature fringe, opting for a more sophisticated side-part and straight tresses.

Source: Russ Einhorn/Splash News

Jennifer Aniston lit up the red carpet at the premiere of "Marley & Me" with her signature sun-kissed locks.

Source: Vickers/Seligman/Splash News

Eva Longoria Parker debuted a new, longer 'do this week while out shopping in LA.

Source: Jose Perez/Splash News

Diane Kruger looked chic in a simple, side-parted 'do at a Ray-Ban party in Manhattan.

Source: AP Photo/Evan Agostini

Rachel Weisz straightened her signature curls for the 18th Annual Gotham Independent Film Awards in NYC.