GWEN STEFANI is doing a Las Vegas residency at the Planet Hollywood Resort and Casino. She announced 25 dates yesterday, beginning on June 27th. There are more dates in July . . . but then there’s a five-month break before they resume at the end of December. Tickets go on sale on Friday. One of the nice things about Gwen’s Vegas residency is that $1 from each ticket sold will go toward the ‘Cure 4 the Kids Foundation,’ which provides medical treatment to children with life-threatening conditions.