Lindsay back in rehab?

Though a poster has been released advertising Lindsay Lohan's 21st birthday blowout party in Vegas, the Georgia Rule actress is reportedly on her way back to rehab, according to In Touch mag. "She finally realizes it's the right thing to do," a close friend of the star says. "She is going willingly." Lohan was allegedly due to check into Promises in Malibu on Monday afternoon, following a night