Justin Timberlake's nan has dismissed rumours that the singer and his and wife Jessica Biel are planning family.

Timberlake's nan, Sadie Bomar, said the showbiz duo are too busy being famous to have babies, the sun reported. She said that the couple do love each other dearly, but they will have kids when it is a time.

Sadie also confessed she's worried their busy work schedules could damage their romance, explaining that theduo doesn't spend enough time at their marital home.