WHO’S REALLY CHEATING IN HOLLYWOOD

Sienna Miller shocked the world when she was caught on camera brazenly and passionately making out with married actor Balthazar Getty in Positano, Italy, in July. Sienna should have known better. After all, her ex-fiancé Jude Law infamously cheated on her with his children’s nanny in 2005, causing “a loss of innocence on my part,” she said. “I was blinded by being a romantic person.” And she’s not the only star to have been betrayed. Bold-face names from Halle Berry to Mary-Kate Olsen have also had unfaithful partners. “I’ve been cheated on a time or two,” country star Carrie Underwood has admitted. “It’s tough.”

“Cheating is more prevalent in Hollywood than the fans could fathom,” Paul Barresi, a private investigator in Los Angeles, reveals to In Touch. “A lot of stars present themselves as dedicated spouses or boyfriends and girlfriends, but behind closed doors they often live parallel lives.” Many celebrities go to great lengths to conceal their trysts. “I know of one star who’d kiss his wife goodbye and in less than an hour be at a five-star hotel taking the service elevator to the top floor to be in the arms of his lover,” Barresi says. “I’ve known stars who troll the red light district, hiding behind tinted windows, sometimes dressed in disguise, searching for a sexual fix with a stranger.”