Los Angeles: Actress Julia Roberts and Danny Moder's marriage is reportedly in trouble due to actor Owen Wilson. The Academy Award-winning actress is reported to have been cheating on her husband of 14 years with the actor, with whom she has been filming the adaptation of "Wonder", reports aceshowbiz.com. "After persistent rumours that her marriage is in trouble, the pretty woman gets close to a co-star she's been crazy about for years. The star's marriage to Danny Moder which has been plagued by rumours of strife for the past two years is unravelling, placing Julia in a gut-wrenching situation many believe will end in divorce," a source told the star magazine. "The budding relationship has become so serious that Julia and Danny are fighting about it, and the Oscar winner may be on the verge of pulling the plug on her 14-year marriage. They're constantly flirting, supporting each other, joking. It's like they are a couple," the source added.