Justin Timberlake's 'Side Splitting' Comedy Prompts Jessica Alba's Labour

New mum JESSICA ALBA has credited her THE LOVE GURU co-star JUSTIN TIMBERLAKE with kick-starting her labour.

The Fantastic Four beauty 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 (08).

And she's convinced Timberlake's hilarious onscreen antics 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.

"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."

And she is full of praise for the singer's acting talents: "He's a natural actor, with a great sense of humour."