Demi Lovato, the Jonas Brothers, David Archuleta and other celebs attended the 15th Annual Music and Tennis Spectacular honoring Arthur Ashe at the USTA Billie Jean King National Tennis Center in Flushing Meadows, NY on Sunday.

David looked humorous with a giant racket, while Demi played with an enormous tennis ball.

Other celebrities at the event included Nick Cannon, the band Allstar Weekend, and skier Lindsey Vonn.

The 2010 U.S. Open, played at the venue, got underway earlier today.

Looks like someone else likes big balls, too.

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