Demi Moore and Ashton Kutcher
Age gap: 15 years
She was queen of the Brat Pack in the 80s, his career didn't even start until a few years back. Demi and Ashton shook up the celebrity world when it became apparent they were an item. A fairly big gap of 15 years meant they've certainly had tongues wagging but it looks like this one is for good after the couple recently tied the knot in a private ceremony.