What better way to follow up our poll for favorite rising star [1] than biggest trainwreck? From DUIs to rehab to prison time, 2007 was far from being the best year for this list of celebs. A few have started to clean up, giving us hope for 2008 but that doesn't mean we've forgotten about their antics from the beginning of the year. So tell us — who is the biggest trainwreck of 2007?

Don't forget to vote on all of our Best of 2007 polls! [2]