Robbie Williams is due to be wed to Ayda Field on Saturday. The pair met while filming a show in LA and share an unhealthy passion for hunting for UFOs in California.

William Hill (use bonus code F25 to claim £25 free) are offering 1000/1 that a UFO can be spotted in the wedding photographs of the pair and 500/1 that the best man is an alien.

Hills are also quoting 500/1 that the soon to be Mrs. Williams will turn out to have alien DNA in the future.

Hills yesterday shortened the price of alien existence being confirmed by the incumbent Prime Minister or President of USA to a lowest ever 80/1.

Having rejoined Take That, Robbie and the boys are 3/1 to get the 2010 Christmas Number 1 single, while Robbie himself is 10/1 to get a solo Christmas Number 1. Take That are also 4/1 to headline the Pyramid Stage at Glastonbury next year.

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Hill’s spokesman Joe Crilly said: "Ayda and Robbie enjoy a nice bit of UFO spotting together, as you do.

"It appears that she found what she was looking for - a strange creature with a big head from another planet."