Gwyneth Paltrow and Chris Martin

Age difference: 5 years

Okay, so not a scandalously vast age gap here but enough to prompt the odd call of 'you go girl!' to Gwyneth next time you see her popping down to the supermarket in Belsize Park.

Having previously had a high-profile romance with Brad Pitt as well as flings with Ben Affleck and Luke Wilson, Paltrow married Coldplay singer Chris Martin in 2003.

The pair have two children, Apple, 3, and Moses, 1.