Jennifer Lopez and Casper Smart walked back to their London hotel yesterday after a date night that included dinner at Hakkasan and a showing of Michael Jackson's Thriller Live. They're in the UK for the latest stop on J Lo's Dance Again world tour — she's taking the stage at the O2 Arena tonight. Before her big performance, though, J Lo stepped out solo at Harrods this morning. She's been making a habit of retail therapy during her recent travels, having also shopped during her short stays in Paris and Spain. J Lo broke from singing and shopping to attend the Chanel show during Paris Fashion Week. She brought her daughter, Emme, along for the runway presentation, which was the 4-year-old's first.