Night & Day! Celebs Who Dramatically Changed Their Style

Jared Leto is snapped in his grungy, rocker style in 2000. On Nov. 6, 2011, Jared was hopping around the scene with one of his sleek, tailored pieces that he mixed with his signature rocker style. Which style do you prefer?

Before Katy Perry was wearing cupcakes and rubber dresses, she was snapped in several boho chic ensembles, like the one pictured here in 2005. Now Katy is known for her vintage-meets-candy store style, ever-changing hair color and tongue-in-cheek designs. You never know what Katy's going to show up in -- but it's always highly stylized! Which style do you prefer?

Kelly Osbourne used to sport punky, in-your-face clothes, as seen here in 2009. Now a fixture at Mercedes-Benz Fashion Week, Kelly is revered for her quirky-meets-glam, high-fashion style, as seen here on Oct. 24, 2011. Which style do you prefer?

Few stars have changed their style as much Taylor Momsen. When Momsen first started on Gossip Girl, she was often spotted wearing very trendy, glittering ensembles, as seen here on Dec. 2, 2008. However, Taylor soon transitioned into a sexed-up goth fairy, snapped here at the third annual Revolver Golden God Awards on April 20, 2011. Swapping a shaggy 'do for long longs, high heels for buckled boots and tights for thigh highs, Taylor has completely remade herself. Which style do you prefer?

Before Gossip Girl, Blake Lively had a beachy keen style. Photographed here on Aug. 14, 2005 at the Teen Choice Awards, Blake smiled wide with beachy hair and a summery tube dress. Since taking on the role as Upper East Side fashionista Serena van der Woodsen, Blake has opted for a more high-fashion look, as seen here in the gray ensemble she donned on Nov. 15, 2011 in
New York City.
Which style do you prefer?

Before she was cast as the Girl with the Dragon Tattoo, a smiling Rooney Mara (pictured at the premiere of Youth in Revolt on Jan. 6, 2010) lit up the red carpet in flirty frocks and wavy brown hair. Ever since taking on the role of Lisbeth Salander, a smileless Rooney (pictured at the The Girl With The Dragon Tattoo photocall on January 4, 2012 in Madrid,
Spain) has been seen with a severe haircut and dark, edgy style. Which style do you prefer?

When Rihanna first started out, she rocked a more urban style. The young singer was often snapped wearing midriff baring tops and baggy jeans, as she is pictured here at a party hosted by Jay-Z on July 20, 2005. Now, Rihanna is known for her chameleon-like fashion sense. Rihanna is often seen rocking the red-carpet in edgy and avant-garde designs, like the sexy all-white number she wore to the 2011 Billboard Music Awards on May 22, 2011. Which style do you prefer?

When Nicole Richie was best friends with Paris Hilton, she was often spotted in the clubby attire of short dresses, tight tops and lots of make up, like the outfit pictured here taken at the Teen Vogue's first annual Young
Hollywood issue party on Sept. 5, 2003. Now the mom of two is known for her sleek-mixed-with-bohemian style. Here Nicole is pictured wearing an  elegant and understated black dress to the 15th Annual ACE Awards at Cipriani 42nd Street on November 7, 2011 in New York City. Which style do you prefer?

From super cute to goth princess, stars like Rooney Mara and Taylor Momsen have totally altered their look. Take a look some of the stars who have made drastically different style transformations! Pick your favorite versions!