New haircuts seem to have emerged as must-haves for celebrities this season. After the Canadian teen sensation, Justin Bieber, broke thousands of Beliebers' hearts by losing his signature floppy hair, the FRIENDS star Jennifer Aniston sported a brand new hairdo on her 42th birthday.

The birthday girl flaunted her sexy new hairdo at the Madrid premiere of her new film Just Go With It on Tuesday.

The blond beauty, who set the trend in the '90s with her out-of-the-bed hairstyle in the popular sitcom FRIENDS, has gone shorter with her hair.

Start slideshow to see the photos of Aniston flaunting her new hairdo in Spain alongside cast members Adam Sandler and Brooklyn Decker:

Jennifer Aniston poses to promote her movie Sigueme el rollo in Madrid
Jennifer Aniston poses to promote her movie 'Sigueme el rollo' (Just Go With It) in Madrid February 22, 2011. REUTERS/Susana Vera
Jennifer Aniston and Adam Sandler laugh
Cast members Jennifer Aniston (R) and Adam Sandler laugh as they arrive to promote their movie 'Sigueme el rollo' (Just Go With It) in Madrid February 22, 2011. REUTERS/Susana Vera
Jennifer Aniston, Adam Sandler and Brooklyn Decker
Cast members Jennifer Aniston, Adam Sandler and Brooklyn Decker (L-R) pose to promote their movie 'Sigueme el rollo' (Just Go With It) in Madrid February 22, 2011. REUTERS/Susana Vera
Aniston, Sandler and Decker pose on the red carpet as they arrive for the German premiere of the movie Just Go With It in Berlin February 21, 2011
Before the Madrid premiere, Jennifer Aniston, Adam Sandler and Brooklyn Decker landed in Berlin for the German premiere of the movie 'Meine Erfundene Frau' (Just Go With It) in on February 21, 2011.This was the last time Aniston was seen with her longer 'do. REUTERS/Thomas Peter
Cast member Jennifer Aniston attends the premiere of Just Go With It in New York
Ahead of the Spain and German premieres, Jennifer Aniston attended the premiere of 'Just Go With It' in New York.In this photo dated February 8, 2011, Aniston flaunts her long tresses that the fans have come to love. Nevertheless, her new hairstyle gives her a sassier look and has already begun to impress. REUTERS/Eric Thayer