Lohan strikes a sexy pose on the set of a photo shoot in the Hollywood Hills. Plus: Kim Kardashian, John Mayer, Rihanna and more

IT'S ONLY A TEST

John Mayer makes a late night – and last minute – appearance at L.A.'s Hotel Café where the singer tested out new songs for fans Wednesday night. "I trade you new songs for no videoing them?" the singer wrote on his official Twitter of the gig, adding, "Need guinea pigs."