I am only doing the ones that ATRL cares about, you can click the link below for the full list.
Jennifer Lopez
Long before she was on "American Idol" every week, Jennifer Lopez was just a Fly girl on TV's "In Living Colour." So if we're getting technical, she was a dancer before her breakout role portraying famed Mexican pop star Selena -- an endeavor that fittingly led into her own music career. Six albums (and what feels like a million rom-coms) later, J.Lo is preparing for her next album, "Love?" in March.
Jamie Foxx
There's no doubt Jamie Foxx beautifully channeled the spirit of Ray Charles on the big screen, but the actor continued to show off his musical skills by releasing four R&B albums since -- and charting in the top 10 with 2006's "Unpredictable" and 2009's "Blame It." Coincidentally, Foxx's biggest musical splash has been his collaboration on Kanye West's "Gold Digger," on which he sings a Ray Charles-esque hook.
Jared Leto
For years, Jared Leto was most know for being the gorgeous, clueless Jordan Catalano on the short-lived, but much beloved mid-'90s teen drama "My So-Called Life." But even while he was projecting his angst on the sound stage, Leto's real aspiration was to take his talent to the music stage. The same year MSCL was cancelled, Leto formed alt-rock band 30 Seconds to Mars, who rose to platinum prominence with their 2005 album "A Beautiful Lie." While the band has been successfull, Leto has not turned his back on acting. He's appeared in several films over years, including 2007's "Chapter 27," where he portrayed John Lennon killer Mark David Chapman.
Zooey Deschannel
Consider us completely unsurprised that the "500 Days of Summer" actress who looks like a hipster Katy Perry and is married to the lead singer of Death Cab For Cutie is in an indie rock band. She & Him, Deschanel's collaboration with folk guitar hero M. Ward, has given the world two delightfully retro records since 2008.
Lindsay Lohan
Years before LiLo's Hollywood misbehaving became front-page fodder for tabloids, she was a budding teen actress who longed to channel her movie-star status into pop gold. After recording a few songs for movie soundtracks, Lohan made her first real attempt at the charts with 2004's platinum-selling "Speak," which included several songs co-written by American Idol alum Kara DioGuardi. A second album, "A Little More Personal," followed in 2005 that included the No. 1 dance single "Bossy."
Hilary Duff
Hilary Duff is surprisingly masterful at moving from one field to another. She rode the wave of her "Lizzie McGuire" success straight into a film and music career via the Disney Channel show's official movie and its soundtrack, which featured her hit debut single, "Why Not." Duff was on top of the teen world for a while, scoring three platinum albums in the mid-2000s, starring in the "Cheaper By the Dozen" films and launching her own clothing lines.
http://www.billboard.com/features/25...2.story?page=1