“No Doubt” about it: Gwen Stefani is headed to Vegas! Us Weekly reports that the 48-year-old pop diva is the latest artist taking her talents to Sin City, where she’ll perform a residency at Planet Hollywood. On Sunday, Stefani Instagrammed a pic that showed her backstage at Jennifer Lopez’s residency at the same venue. “@jlo your Vegas show was so good!” Stefani captioned the snap. Meanwhile, a source notes, “She went to the show last night to check out the venue she’ll be playing. She was dancing the whole night!” Britney Spears also used the same venue for her long-running Vegas residency.