Jennifer Aniston had no idea she would be upstaged by the dogs in her new movie.

The 40-year-old actress admits she and Owen Wilson often struggled to steal the limelight from their canine co-stars while filming romantic comedy 'Marley and Me'.

Speaking about the character of Marley - who was played by 22 different Golden Labradors - Jennifer joked at the UK premiere of the film in London's Leicester Square last night (02.03.09): "They didn't warn us about that. Those dogs in the movie were really good!"

Owen, who looked dashing in a dark grey Burberry suit, laughingly revealed the dogs didn't always behave themselves during filming.

He explained: "There was one scene where one of the Labradors kind of lifted his leg and he wasn't supposed to."

Owen - whose own pet Garcia had a cameo in the movie - insists he and Jennifer enjoyed working with the loveable animals because they are both dog owners.

He explained: "I had a real soft spot for Copper, who was a 25-year-old Labrador. But they all did great."

Both stars braved chilly temperatures to sign autographs and pose for photographs with fans.

Jennifer - who was wearing a blue floor-length strapless Burberry dress and Azzedine Alaia high heels - didn't stop shivering until she slipped on a black Burberry fitted jacket.

The former 'Friends' actress revealed she hopes to work with Owen, also 40, again in the future.

Speaking about a possible collaboration, Jennifer said: "That would be nice. We had a great time."

'Marley and Me' - based on the best-selling autobiographical book by John Grogan - tells the story of a young married couple who end up buying a puppy which they soon realise is the "world's worst dog".