Heartthrob couple Justin Timberlake and Jessica Biel are expecting their first child, Timberlake’s former bandmate says.

Joey Fatone, who performed with Timberlake in the boy band ‘NSync, confirmed Biel’s long-rumoured pregnancy in an interview to be released on Wednesday.

“He told me a while ago, and I kept my mouth shut,” Fatone told In Touch Weekly.

“Jessica is awesome, and Justin is a kid at heart,” he was quoted as telling the magazine.

Timberlake, 33, made his start as a child television star before joining ‘NSync.

He more recently has become one of the music industry’s most popular solo singers and has starred in movies including the Facebook-themed drama The Social Network.

Timberlake in 2012 married Biel, 32, who has found success both on television and in film.