The wacky wager was dreamed up by the Paddy Power organisation, who are also offering 66/1 against the former Republic of Ireland duo having a fight.
England coach Sven Goran Erikssson is 50/1 to marry Ulrika Jonsson, which the Irish bookmakers consider less likely to happen than Posh and Becks divorcing (28/1).
The good news for Beckham is that he's just 16/1 to be knighted - and if you fancy a father-son double, Rod Stewart, is a snip at 4/1.
Paddy Power rivals William Hill have Terry Venables at 33/1 to become England coach in 2003 - the same odds as Robbie Williams to be named the next James Bond.
If you fancy a 50/1 flutter, you have a choice of a Liverpool-Everton FA Cup final or Cherie Blair releasing a fitness video, while 100/1 is offered against Ken Bates being named BBC Sports Personality of the Year.
And finally, the real outsiders.
At 500/1 you can back Michael Jackson to receive the world's first head transplant, Elvis to be discovered alive, or... a Birmingham-Villa Cup final.
Now that really is ridiculous.