Lindsay Lohan LindsayLAXHost.jpgOur favorite rehabber Lindsay Lohan shall face a difficult challenge this upcoming New Year's: The sober actress is set to host a gig at Las Vegas hot spot LAX (which is owned by Pure Management Group). Why? Because she bailed on her July 2nd birthday bash at PURE - and instead focused on her rehab treatment. "Lindsay doesn't want to host, but she's contractually obligated," a source says.

Hmm, so either Linds must test her sobriety and host the bash or pay back the "hundreds of thousands of dollars" she received in the first place... right?