Meg Donnelly, Austin Mahone appear at Arthur Ashe Kids' Day (15 images)

Actors and musicians attended and performed at the 24th annual Arthur Ashe Kids' Day, which features a concert and tennis matches at the USTA Billie Jean King National Tennis Center in Queens, N.Y., on Aug. 24, 2019.

Novak Djokovic of Serbia stands on the court with kids and performers at the conclusion at Arthur Ashe Kids Day. Photo by John Angelillo/UPI

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Meg Donnelly, star of "American Housewife," performs. Photo by John Angelillo/UPI

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Austin Mahone performs. Photo by John Angelillo/UPI

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Sloane Stephens stands among dancers on the court. Photo by John Angelillo/UPI

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