What's better than spending a leisurely Saturday on the tennis courts? Doing it with Demi Lovato, Colby O'Donis, and Menudo at the USTA Billie Jean King National Tennis Center for Arthur Ashe Kids' Day! We got the deets on their new albums, watched them perform, and chatted about how we all wish we could play like the Williams sisters. Wanna know more? Check back for interviews and more exclusive pics!