Joe Jonas and Demi Lovato Duet for the Kids (PHOTOS)

Ex-sweethearts Joe Jonas and Demi Lovato teamed up to belt out a duet on center court at the 15th Annual Arthur Ashe Kids’ Day, held at Arthur Ashe Stadium in New York on Saturday.

Aside from honoring the memory of tennis great Arthur Ashe (who passed away of AIDS in 1993) and his efforts to help children through tennis, the annual event serves as the beginning of the US Open tennis tournament every year with a combination of musical performances and tennis matches. (Former American Idol contestant David Archuleta also performed at this year’s Kids’ Day.)

Click through the photo gallery to see JoJo and Demi belt it out for the kids. And make sure to visit Paparazzi-Razzi for more pics of famous people doing intriguing things.