Insiders say Lindsay Lohan is more obsessed with hooking up with guys than getting treatment for her drug addiction.

She's been accused of breaking up the marriage of another fellow patient- musician Tony Allan, 39 - and was reportedly referred to by Tony's billionaire wife Stephanie in their divorce proceedings.

"After my husband's return from rehabilitation I was bombarded by calls alerting me to the fact that my husband's conduct with another woman was on the Internet and in gossip magazines," said a humiliated Stephanie.

Now, Lindsay has moved on to Richie Sambora - who is much more famous than her last rehab shag. "He's just her type," a source says. "Older, famous and hot." And insiders say he finds the young star hard to resist. "There was no way Richie was going to turn her down."