Beyonce Knowles and Jay-Z sat courtside in Dallas last night to watch the Mavericks take on and defeat the LA Lakers. The two are wrapping up a sweet week together, which kicked off with a relaxing few days on a yacht in Miami. Jay also performed in the Texas city on Tuesday night, with his loving wife cheering him on from the audience. The two are more and more open with their love these days, but they're still keeping their senses of humor at hand when they want to play it coy — like Jay saying it was all him who invented the "Single Ladies" dance.