Gwyneth Paltrow has sparked rumours that she is pregnant with husband Chris Martin, after spending much of last night hiding her rotund tummy behind a clutch bag.

The Iron Man star stepped out yesterday evening with her designer pal Stella McCartney, but her usually slender frame marred by a slight bulging tummy was visible through a thigh grazing silver dress.

Gwyneth and Coldplay singer Martin already have two children together, 4-year old Apple and two-year old Moses.

Could baby number three be on the way? See our gallery here and judge for yourself.