He’d Never Cheat On Gwen Stefani! Gavin Rossdale’s Mystery Woman Was Actually His Sister Looks like Gwen Stefani and Gavin Rossdale are having a good laugh over claims the rocker was caught getting close to another woman during a recent hike as the “mystery blonde” is actually the Bush frontman’s sister. The 47 year-old was photographed during a hike in the Hollywood Hills with his sons Zuma and Kingston over the weekend and in one snap placed his hand on the back of the woman he was with. This set tabloid tongues wagging though according to RadarOnline the ‘hot nanny’ is actually Gav’s sister Soraya.“All the speculation is hilarious,” a source told the website.“And couldn’t be further from the truth. Gavin and Gwen are happier and more in love than ever and their marriage is absolutely rock solid. They truly have one of the happiest marriages in showbiz, or outside of showbiz for that matter.”They added: “It really comes to something when a guy can’t go for a hike with his little sister without being accused of cheating on his wife!”Poor Gav, the stud literally can’t touch another woman without rumours starting – even his sister!