Demi Lovato & Jonas Brothers: Arthur Ashe Kids Day!

Demi Lovato lets out a hearty laugh with her BFFs Joe and Nick Jonas as she holds up a giant Wilson tennis ball at the 2010 Arthur Ashe Kids Day in Queens, NY on Saturday afternoon (August 28).

The trio, plus older brother Kevin, enjoyed a full-day of tennis and music for children and families, including interactive games, musical entertainment and grounds activities honoring the legacy of Arthur Ashe as the US Open begins.

Also performing at the festival were David Archuleta and Allstar Weekend. Their pics will be posted soon!

25+ pics inside…