So while we might be wearing our hat on the couch instead of in the pews, and we might be munching on popcorn instead of dining on the finest salmon, we are still looking forward to having a peek at the couple's nuptials. And while they might be doing things live, they're certainly not the first pair to invite a few cameramen along to their special day. These other celebrity duos did the same - with varying results...
The Bachelorette's Trista Sutter & Ryan Sutter (2003)
If Sean and Catherine are hoping to make their marriage last, they could take a few hints from Trista and Ryan! The couple, who met on the very first season of The Bachelorette, tied the knot in 2003 in a three-part miniseries for ABC (and it probably helped that they netted a cool $1m from the network to do so). The couple, who now have two kids, got married at Lodge Rancho Mirage in California in front of friends and family - and a reported 17 million viewers. Plus, Brad Paisley popped up to serenade them. They'll celebrate their tenth anniversary in December. All together now - aww.
Kim Kardashian & Kris Humphries (2011)
Oh dear. In one of the most infamous televised weddings, Kim Kardashian tied the knot with Kris Humphries in an extravagant ceremony attended by a fair amount of celebrity guests - and Kim reportedly raked in £11m. The ceremony aired on E! in a two-part special in early October 2011 - by the end of the month, Kim had filed for divorce. Looking back at the special now, the signs were there (in the way that the duo kept arguing). Things didn't improve after the wedding either, when Kris sought an annulment on the grounds of fraud (and E! insisted the wedding wasn't just for TV). But everyone's moved on now - the couple settled their divorce earlier this year.
Spencer Pratt & Heidi Montag (2009)
One of the best reality TV couples! It was only right that Speidi made things official on The Hills, given that it was on the show that they fell in love. (We'll ignore their supposed elopement a year earlier.) Spencer and Heidi tied the knot in Pasadena, and the ceremony was broadcast as the season finale of The Hills that year. It was all very nice with Lauren Conrad showing up to mend her dodgy relationship with Heidi, but rumours of fakery swirled for ages. Then the couple got married again in 2010 in a small ceremony on the beach. Consider us confused.
Nick Lachey & Vanessa Minnillo (2011)
Well, this one might hurt a little. You might have thought that Nick Lachey would keep his wedding off the television - given that his three-year marriage to Jessica Simpson was documented tirelessly in Newlyweds - but in 2011 he decided to broadcast his nuptials to Vanessa Minnillo in a special for TLC. Anyway, Nick spent most of the run-up to the broadcast explaining how this was different from his time on TV with Jessica Simpson, which is probably not what a bride and groom really want. Still, the happy couple welcomed their first child last year.
Kendra Wilkinson & Hank Baskett (2009)
If we were getting married, we'd find it tough to choose a better venue than the Playboy Mansion. Kendra Wilkinson got hitched to NFL star Hank Baskett there, and it was all taped for her E! show Kendra. In the end, Kendra's brother walked her down the aisle but Hugh Hefner was also in attendance to watch his former girlfriend settle down with Hank. Plus, Holly Madison and Bridget Marquardt were there as bridesmaids. The couple are still together and have a son, Hank Jr.
Khloe Kardashian & Lamar Odom (2009)
Well, this one was a bit more successful than Kim and Kris. Khloe got married to basketball star Lamar just a month after meeting him, which made for great television as Kris Jenner hurried to get everything ready and Bruce Jenner huffed that no-one had told him. (It's okay - they had an emotional reunion and Bruce ended up walking Khloe down the aisle.) This wedding was actually all very sweet (and even a little bit tear-jerking) and we're hoping that the couple weather their reported problems - this is one we'd love to last.
The Bachelorette's Ashley Hebert & JP Rosenbaum (2012)
Another success for The Bachelorette! Ashley and JP tied the knot last December in a lavish ceremony attended by a whole host of Bachelor stars (including Sean Lowe and Ryan Sutter, incidentally). The couple got married in California - and the ceremony was officiated by Bachelor host Chris Harrison.
Dave Navarro & Carmen Electra (2003)
'Til Death Do Us Part is certainly an, erm, 'dark' name for a wedding series, but it probably suited Dave Navarro and Carmen Electra. They starred in the six-part show, which followed them in the run-up to their November 2003 nuptials. The ceremony - complete with a python, flowered metal vines and men in red masks - was attended by stars from The Osbournes to Gwen Stefani, but the couple separated three years later.
Bam Margera & Missy Rothstein (2007)
A Jackass wedding... seriously. Bam has said that $13,000 of damages was caused during his wedding reception after he tied the knot to Missy Rothstein, and the whole shebang was caught on camera for the series Bam's Unholy Union - as with Dave & Carmen, the show aired on MTV and followed the couple's preparations and eventual big day. Iggy Pop and the Stooges even performed at the reception, but the Union did prove to be more unholy than perhaps everyone wanted and the duo divorced last year. In fact, Bam just married his new wife Nicole earlier this month - and popped a video of the event on YouTube.
Jason Mesnick & Molly Malaney (2010)
In yet another Bachelor success story, Jason and Molly - who met on The Bachelor - got married in 2010 and their wedding aired in a two-hour special on ABC. The star-studded ceremony - which saw both Jason Castro and Gavin DeGraw serenading the duo - had a little hitch when a couple of paparazzi were arrested. But it didn't get in the happy couple's way, and they welcomed a daughter earlier this year.
Prince William & Kate Middleton (2011)
The television wedding to end all television weddings - and not just because everyone in the UK got the day off. The huge, very traditional ceremony at Westminster Abbey was watched by an estimated global audience of 300m, which, well, isn't bad. We pored over the details - from grumpy bridesmaid Grace Van Cutsem to Princess Beatrice's hat to the arrival of the Beckhams, and then we all got a bit soppy when the "I Do"s were exchanged (the Duke of Cambridge's smile! His stumbling over the words!). Sean and Catherine have a lot to live up to if they're going to beat the Royals...
What was your favourite television wedding? Let us know below!