Christina Aguilera expecting a baby girl

Christina Aguilera performs onstage during the Hollywood Stands Up To Cancer event on Jan. 28, 2014, in Culver City, Calif.
Charley Gallay/Getty Images for Entertainment Industry Foundation

Christina Aguilera's son is going to have a little sister.

The singer and fiance Matt Rutler are expecting a baby girl, according to People. She reportedly announced the sex of the baby on the way on stage Friday in Malaysia, where she performed.

Aguilera, 33, and Rutler, a film producer, announced their engagement last month.

She's already a mom to 6-year-old Max, with ex-husband Jordan Bratman.