Catherine Zeta-Jones and Michael Douglas could be facing one of the greatest challenges to their marriage yet.
The Welsh actress and her 60-year-old husband are due to go head-to-head later this month - at a charity golf tournament in Newport, Gwent.
The couple, who will be on opposing teams, will be joined by a host of Hollywood stars for a celebrity version of the Ryder Cup. It will take place on August Bank Holiday at the 2010 Ryder Cup venue Celtic Manor Resort.
Swansea-born Zeta-Jones, 35, will be playing in Colin Montgomerie's European team, while Douglas will join fellow American actor Rob Lowe in the US team captained by Mark O'Meara.
Other Brits set to join the fun include media mogul Chris Evans, Charlotte Church's rugby star boyfriend Gavin Henson, model Jodie Kidd, actor James Nesbitt and singer Ronan Keating. The tournament will be broadcast on Sky, presented by Terry Wogan, Kirsty Gallacher and Jamie Theakston.
The idea was dreamed up by golf fans and presenters Ant and Dec, who are executive producers.
Bob Massie, executive producer of TWI, said, 'The players have signed up and we are delighted with the calibre of names taking part. There will be plenty of talent out on the course and competition is likely to be fierce - make no mistake, both Europe and the US are playing to win.'
He certainly got that right. Both Zeta-Jones and her husband have proved unwilling to lose in the past, like the time when they famously battled against Hello! magazine over pictures of their wedding. So how will their marriage cope with the competition?
Well, the couple have been together since March 1999, which is a lot longer than many Hollywood couples. There's been very little gossip about them either, not a sniff of an argument or a hint of impropriety.
In an interview with American style magazine W, Zeta-Jones, mother to Dylan, five, and Carys, two, was quoted saying that she finds divorce obscene, so it's unlikely that the championship will end in the courts. Still, with each team desperate to outdo the other, there could be a lot of pressure to prove who is best.
Douglas is a regular golfer, and organiser of the Michael Douglas & Friends annual celebrity golf tournament in LA.
But Zeta-Jones is no stranger to golf, having competed in her husband's tournament in May this year.
Each match will consist of two players representing the US and two representing Europe. It has not yet been decided which team members will play against each other in each match, but let's face it - who's going to pass up the opportunity of a husband vs wife battle of the sexes?
A practice day will take place on Saturday August 27, followed by two days of competition.
It looks like Ant and Dec were right to promise an event which 'couldn't be more exciting'.