Gwen Stefani chatted with Russian art collector Dasha Zhukova yesterday at the Frieze Art Fair in London. The singer stepped out for a private exhibition, browsing the contemporary paintings on display during the festival's VIP day, in patent-leather oxfords and red lips. The festival gave Gwen a chance to go on a grown-up outing after spending much of the month hanging out with Kingston Rossdale and Zuma Rossdale at the park, the zoo, and the aquarium. The trio have opted to stay put in England while Gavin Rossdale continues his tour with Bush back in the states. His band released a new album this year after nearly a decade-long hiatus, and Gwen's band, No Doubt, will follow suit shortly. After striking out with her own successful solo career, Gwen reteamed with her bandmates in 2008 to start working on new material, and the quartet recently said they expect their new CD to hit stores next year.