'American Idol' season 7 contestant Jason Castro is getting ready to sing some lullabies.

The singer, 24, has just announced on his official website that he and his wife, Mandy Mayhall, are expecting their first child -- a daughter.

Castro writes: "I am excited to announce that there will be a new addition to the Castro family! My wife and I are expecting our first child this August. We just found out yesterday that it is going to be a girl! haha that makes me laugh... what am i going to do with a sweet little girl?! probably just smile alot...I cannot wait!!! It's an exciting time..."