Jessica Alba is convinced that her labour was triggered by the 'hilarious' antics of her The Love Guru co-star Justin Timberlake.

The new mother was watching a private Hollywood screening of the new film just two days before she was admitted to Los Angeles' Cedars Sinai Medical Center to give birth to daughter Honor Marie on 7 June.

And in a canny bit of PR her new movie, she insists that Timberlake's big screen comic turn got her baby ready for delivery.

She says, "I felt something go. I had been very careful of my movements and seating, but it was impossible to sit still when he (Timberlake) was on screen.

Justin Timberlake: 'Hilarious'

"I wouldn't go as far as saying my water broke, but it did feel as if I was actually splitting my sides. I felt completely drained afterwards."

Perhaps little Honor was trying to get away from Justin's comic brilliance?