John and Robin crashed wedding

Old Dogs stars John Travolta and Robin Williams have revealed that they once crashed a wedding party together.

The American actors were enjoying a drink together at a bar in Santa Barbara, California, when they suddenly decided upon joining the celebrations next door.

John said: "We were having fun, starting to relax, when we saw there was a wedding next door. We figured we'd crash it."

Initially, the wedding guests failed to recognise that they were the real stars of shows Welcome Back, Kotter, and Mork and Mindy.

John, 55, added: "They figured out who we were. Some guy yelled out, 'Hey, they really are Mork and Vinnie Barbarino!' "

The pair are now working together in film, comedy Old Dogs, which is set to release next March.

Co-stars in the movie found it hard to cope with their off-the-wall antics and on-set jokes.

John's wife Kelly Preston, who plays Robin's love interest in the movie, said: "The hardest part of being in a scene with any of these guys was not laughing and ruining every single take.

"And if you did laugh, the director just let us go with it, because they're going to be goofy and try to make you laugh."

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