Colin Firth is to go on a date with a fan after the admirer paid $9,300 to meet their idol.

The lucky U.S. bidder beat 64 others to win two tickets for the star-studded world premiere of the actor's new film 'Mamma Mia' in July and a meet-and-greet with Colin. The fan will also attend the premiere after-party in London on July 1. All proceeds raised from the unusual eBay auction go to Oxfam America.

In a video on the site, Colin said: "I am Colin Firth and I am apparently what is known as an Oxfam ambassador. I'm here to offer you the chance to bid for two tickets to this summer's world premiere of the film 'Mamma Mia' starring Meryl Streep and Pierce Brosnan and featuring, last I checked, me."

"If you are the kind of person that always wanted to see middle aged men in tight spandex trying to sing, then this is the film for you. Please support Oxfam by bidding high."

Along with the chance to meet Colin - who has worked with Oxfam for the last five years - fans could also bid for a personalized video birthday message from the 'Love Actually' star. The winner paid an impressive $3,141.52 for the unique gift.

Other Colin auction items included signed DVDs of his movies 'Bridget Jones' Diary', 'Love Actually' and 'Pride and Prejudice'. In total, the actor raised $15,800.48.

A host of other stars, including Scarlett Johansson, Kristin Davis and Djimon Hounsou, are also involved in eBay auctions to raise money for Oxfam America.

Oxfam America is a Boston-based branch of the international development and relief agency, Oxfam International. It offers development programmes and emergency relief services, and campaigns for change in global practices and policies that keep people in poverty.