Then: After getting his first credited role in 1999's 'Cider House Rules,' Erik Per Sullivan starred as Dewey, the sneakily precocious little brother to Frankie Muniz's title character in 'Malcolm in the Middle.' During his run as Dewey, Sullivan also voiced Sheldon in 'Finding Nemo."

Now: The Swedish-born actor last appeared on screen in a minor role in the 2010 thriller 'Twelve.' Sullivan currently attends USC, and for a while was an active Tweeter -- although the 20-year-old hasn't updated his account since April of 2011.