2012 Arthur Ashe Kids’ day brought out many young celebrities and athletes to the USTA Billie Jean King National Tennis Center in New York City. Mindless Behavior, Susie Castillo, Quddus, and Serena Williams were among those in attendance.

Kim and Kourtney Kardashian were spotted as they attended Sunday service with Kourtney’s son, Mason, and daughter, Penelope.  We wonder if the reality show cameras were somewhere nearby.

Take a look at at the pictures of Kim Kardashian, Serena Williams, Mindless Behavior and more in our gallery.