Robert Pattinson plays Water Wars with Jimmy Fallon

Robert Pattinson donned his nicest suit while promoting the upcoming and final installment of Twilight franchise on the Late Night with Jimmy Fallon show.

Robert Pattinson and Jimmy Fallon played a silly game called Water Wars which involved them basically taking it in turns to chuck glasses of water into each other’s faces.

Mischievous host Jimmy Fallon got so wet his white shirt was completely soaked through.

Robert Pattinson, who is dating co-star Kristen Stewart, 22, seemed to come out of the water fight marginally better off though his suit was still sodden.

His face and hair were also left given a thorough dousing and by the end the British star was left looking resigned to his fate and a little sheepish.

This isn’t the first time recently Robert Pattinson’s behavior has been somewhat bizarre while promoting Breaking Dawn-Part 2.

While on the Jimmy Kimmel Live! show on Tuesday he appeared to be drunk and admitted to the chat show host that he had “had a little vodka backstage”.

Robert Pattinson, who plays vampire Edward Cullen in the smash hit films, also slurred his words and jumped about excitedly trying to hide his too-big “clown” shoes.

Despite being a bit tipsy though his interview was still engaging and Robert Pattinson admitted that even though he gets to travel the world, he is so busy promoting his movies that he doesn’t get to see many of the wonders of the places he visits.

He told the Kimmel: “I’m a freak, I want to stay in my hotel room all the time.”

Breaking Dawn-Part 2 is set to premiere at the Nokia Plaza Theatre in Downtown Los Angeles on Monday.