Less than a month after leaving Utah's Cirque Lodge, Lindsay Lohan is poised to make a comeback to the club scene. A source says the actress is set to host a New Year's blowout at Las Vegas hotspot LAX. But Lohan isn't exactly breaking out the noisemakers about the gig. "Lindsay doesn't necessarily want to host, but she's contractually obligated," an insider says. Lohan took the gig in order to pay back the "hundreds of thousands of dollars" she got for agreeing to host her 21st birthday party in Sin City at PURE Nightclub (which, like LAX, is owned by Pure Management Group). Lohan was forced to scrap the July 2 bash to focus on her treatment in rehab. Adds the source, "She already took the money from the birthday gig and can't afford to pay them back." Her rep had no comment.source