Mumford & Sons star MARCUS Mumford became a real life wedding singer over the weekend (14-15Dec13) by serenading a friend as he walked down the aisle.

The British musician acted as an usher during his pal Jake Warren's wedding to Zoe Stewart in London on Saturday (14Dec13), but he also sang and played guitar at the Chelsea church during the service.

Mumford, who attended university with Warren, was joined at the ceremony by other guests including British royal Princess Beatrice.

Prince Harry was reportedly unable to attend as the ceremony took place just a day after he completed his charity polar trek in Antarctica.