Prince William and Kate Middleton aren't even married yet - that will take place April 29 - but some Britons are already betting they will end up getting divorced.
The odds are unlikely, the topic is disrespectful but when two people disagree on a subject, it's time to lay some money down.
"There's a real tradition of betting on what the royals will do next," said Darren Haines, a spokesman for bookmaker Paddy Power. "The U.K. has a strange fascination with the royals."
One of the most popular wagers for the past several years has been on if, when and where Kate and Wills would marry. After news of their engagement broke in November, the when - as in, what month - brought in £30,000 ($48,000) worth of bets for Ladbrokes, spokesman Alex Donohue said. The where - now confirmed as Westminster Abbey - drew about £15,000 ($24,000) worth of wagers for the betting firm.
With those questions answered, bookmakers are looking to capitalize on the royal wedding mania by adding novelty bets before more details emerge. The market is small now, but expected to swell as the big day draws near.
Middleton will arrive at her wedding ceremony by car and leave by carriage, so she won't have to worry about the current odds of a Tube strike on her wedding day. Will she walk into Westminster Abbey right on time, be three minutes late, or make guests wait 11 minutes for a glimpse? How long will the train of her dress be? Gamblers are invited to place bets on all the above.
Most bookmakers are running a variation of the divorce question, with almost certain odds that the couple will make it to their 10th anniversary.
London retiree Lisa Barret thinks that's an "awful idea" for a market.
"You don't gamble on something like someone's marriage," the 55-year-old said while out shopping for groceries in London.
Bookmakers beg to differ and are eagerly considering suggestions for additions to the "wedding special" options as April 29 approaches. It might seem that nothing is off limits yet even bookmakers draw the line somewhere - rejecting wagering on the likelihood of a terrorist act on the day of the ceremony.
"We don't look to bet on anything that's distasteful so we refused that request," Haines explained. "This is all about fun."
The average wager - £3.5 ($5.50) - reflects that gamblers are betting money they don't mind losing, a spokesman for bookmaker William Hill said.
"It's largely people speculating, more for fun and a conversation piece than those who are genuinely expecting to make money," said Rupert Adams.
London accountant Rana Theva is not surprised by the betting fervor.
"People will place bets on just about anything," the 34-year-old said. The 'X Factor' (singing competition), horses, lotteries ... So why not the wedding?"
William Hill is looking to add 3 or 4 new wedding specials a week. Bets are still open on the location of William's stag party and who his bachelor brother Prince Harry will take to the wedding as his date.
But since they never know when the palace - or the tabloids - will spill the beans, betting is time-sensitive. Wedding-special markets need constant review because, unlike a football or rugby match, decisions are already in the works.
Betting on the couple's honeymoon destination closed down at William Hill on Jan. 10 after an attempted wager of £5,000 ($8,000) in favor of Kenya by a new account raised red flags.
"Nobody would risk £5,000 unless they knew already that they were definitely going to go to Kenya," Adams said. "Whether it was someone from Kenya ... a (real) estate agent ... who knows? We were uncomfortable to bet on it."
The market is "pretty quiet" so far, he said. William Hill has seen about 1,750 wedding-related bets worth about £27,883 pounds placed since news of the engagement.
By comparison, more than £300,000 ($476,000) worth of bets were placed during the final episode of Britain's beloved "X Factor." Still, Adams said he expects volume to ramp up heavily right before the wedding.
"The vast majority of people placing a bet want to place a bet and get a result within a short period of time," he explained. "They'll probably wait until the last minute."
After all, the public won't know until at least April 29 if James Blunt's "You're Beautiful" - the odds-on favorite for the couple's first dance - was in fact chosen.
Bookmakers' core client base - typically male, betting on sports such as horse and dog racing - might not know the difference between Blunt's ballad and Bryan Adam's "Everything I Do," which is also on offer.
But the royal wedding market gives the country's betting houses a rare chance to draw in female customers.
"Reality TV and royal wedding (bets) appeal to women because it's what they read about, it's what they're interested in," Paddy Power's Haines said.
Walking into a Ladbrokes shop in central London, Will Tanner called the wedding-special market "absolutely barking mad."
"Why would I want to bet on shoes and dresses?" the 47-year-old health worker said. "It's a little too girly for me, a little too soft. Not like horses."
Royal Wedding Specials
Among the categories for wagers being placed at Paddy Powers this week:
• What color dress will Kate wear?
• What will be the length of Kate's train?
• What color hat will the Queen wear?
• What designer suit will Prince William wear?
• Who will be Maid of Honor?
• Who will be Prince Harry's guest at the wedding?
• Where will Stag Night take place?
• Who will attend the wedding?
• Will Kate include "obey" in her vows?
• What will U.K. television viewership total be?
• Will it rain on the wedding day?
• What titles will the royal couple take?
• Where will royal couple spend their honeymoon?
• What will be their official London residence?
• Who will be the next monarch?
• Will they be divorced by 2020?