Leif Garrett's been battling substance abuse problems for years, which is why he took part in Season 4 of 'Celebrity Rehab.' However, he stormed out of the Pasadena Recovey Center, later telling 'The Los Angeles' Times that producers encouraged him to relapse for dramatic purposes.

Last night Bob Forrest and Rachel Uchitel checked up on Garrett as part of 'Celebrity Rehab Revisited' (Sun., 9PM ET on VH1) and things did not go too well. Garret told the pair that he'd been taking lots of painkillers following a serious motorcycle accident, and then he admitted dabbling in marijuana and booze.

That's when Bob criticized Garrett's "cavalier and laissez-faire attitude toward alcohol," which did not sit well with the former teen idol. Saying "I really do not appreciate it," Garrett walked out. Again.