From super popular to "who are you again?" check out 13 celebrities who fell off the planet. Maybe they're all just busy planning their comeback tours.
Freddie Prinze, Jr.
After firming up his 90s heart throb resume, Freddie Prinze Jr. went blonde for Scooby Doo and then disappeared. He's busy raising kids with Sarah Michelle Gellar.
Rachel Leigh Cook
Like Freddie Prinze, Jr, her costar in She's All That, Rachel Leigh Cook has taken a step back from the limelight to let her hot husband Daniel Gillies shine. The two work on Indie films together.
She was on her way to becoming an It Girl as Marissa Cooper, then she was killed off of The O.C. and she fell into a drug spiral.
The highlight of Adrien Brody's career was winning an Oscar and kissing Halle Berry.
From movie starlet to mom, Jessica Alba isn't acting anymore. She's selling high-end, green baby products.
Renee Zellweger is so far off the map, this is the most recent photo we have of her.
Cuba Gooding, Jr.
From Jerry Maguire to straight-to-DVD releases, Cuba Gooding, Jr. is no longer a household name.
Helen Hunt was an Emmy nominee and/or winner for seven straight years, a tornado chaser, and now she's....we're not really sure.
She was Jack Bauer's daughter and then she was nobody.
Rosie Perez was on her way to super stardom and then she became the voice of a camera on Dora the Explorer.
We're not sure where Eliza Dushku went, but we'd certainly like to see more of her.
Pauly Shore made a name for himself with stoner comedies. And then he disappeared.
This is Billy Boyd. You might know him as Pippin in Lord of the Rings. And that's all you'll know him as. Probably.