Lance Bass may have found his newest babysitter in Britney Spears. On Monday, the pop star, 41, shared photos of her meeting the *NSYNC alum’s twins, Violet Betty and Alexander James, 20 months. “I’m a new auntie for Lance’s babies !!! They are absolutely gorgeous babies !!!” Spears wrote on Twitter. I’m a new auntie for Lance’s babies !!! They …