It was mid-life crises all round when a group of middle-aged Hollywood stars donned leather jackets and cruised into London's Leicester Square on Harley Davidsons.

At least John Travolta, Ray Liotta and Tim Allen had an excuse - they were taking part in the London premiere of their new film Wild Hogs, a comedy about a group of ageing bikers on a road trip.

Travolta, 53, said making the film was a "blast", and that he's already agreed to star in a sequel. He said: "It was the kind of movie I wanted to be in. It was a blast with four guys that were fantastic comedians and the fun between takes was even more fun than doing the movie."

Tim Allen, also 53, paid tribute to his co-stars, saying: "Once you talk to John you realise he is about ten-years-old. He's like everyone's annoying younger brother. Ray's real serious but John's not serious. John likes everything his way."

Ray Liotta, 52, added: "Some movies are a grind but this was a lot of fun."

The trio's co-stars, Martin Lawrence and William H Macy didn't attend the premiere, although the usual host of reality TV celebs, including Jermaine Jackson, Simon Webbe, Emma Forbes and Right Said Fred's Fred and Richard Fairbrass turned up.