Jennifer Lopez and Casper Smart in London | Photos

J Lo and Casper Brush Up on Dance Moves For a British Performance

Jennifer Lopez and Casper Smart arrived at a dance studio in London.

Jennifer Lopez met friends for dinner at the Dorchester hotel in London last night, and she reemerged today holding hands with boyfriend Casper Smart for a trip to a London dance studio. Jennifer and Casper are perhaps brushing up on their dance moves ahead of her appearance on Britain's Got Talent tonight. She will perform her single "Live It Up" for the show despite suffering a bit of jet lag from her travels, which she revealed on her Twitter account, saying, "Up early . . . Are u ready London! Excited about my performance tonight. Who's tuning in? Britain's Got Talent. Live It Up. Going to be fun. Jetlag."

Although she may be sharpening her dance moves before taking the stage this evening in the UK, Jennifer has had plenty of practice performing her latest single. Last weekend, she attended the Billboard Music Awards to perform the track, and she also sang "Live It Up" on the season finale of American Idol earlier this month.