American Pie cast enjoys sighseeing in London

The stars of American Pie took time out from their busy schedule promoting the latest movie in London on Monday to embark on a whirlwind sightseeing trip around the capital.

The main actors in the comedy franchise - including Seann William Scott, Mena Suvari, Jason Biggs, Tara Reid and Chris Klein - all appear in American Reunion, their first time onscreen together since 2001's American Pie 2.

They headed to London earlier this month to promote the movie, and they all hopped onto an open-topped bus to enjoy the sights when they were given a few hours off.

Biggs took to his personal WhoSay page to upload a snap of Big Ben and a photo of his pals on the bus, while other images show the group passing attractions including the Houses of Parliament and Tower Bridge.

Reid told her Twitter.com fans, "americanpiereunion in london with all the gang. Londoners you may spot us on a big red bus."