But while some simply show up and leave only a few snaps with the bride and groom as their entrance fee, it seems pop star Pixie Lott is a little more au fait with wedding etiquette - performing a song live for the visibly surprised guests.
The star turned up at the wedding of Ben Haslam, 34, and new wife Rachel, 30, and performed an acoustic version of Use Somebody, before heading off to headline at another special gig at the Manchester Town Hall.
“My jaw dropped to the floor when Pixie walked in," the bride told The Sun.
“She sang then came over to say congratulations and we took pictures."
The stage star, 26, was reportedly on her way to turn on the Christmas lights at Manchester Town Hall when she was spotted by a wedding guest.
The guest Tweeted the singer asking her to drop by, which she did - and performed her version of Kings of Leon's Use Somebody.
“It made a memorable day even more memorable. You don’t expect a pop star to sing at your wedding,” said the bride.
When it comes to her own wedding however, the star has admitted she is a little further from walking down the aisle herself.
Recently she revealed that she has not made any solid wedding plans for her and fiancé, model Oliver Cheshire's big day, as both has been so busy with their careers.
One thing is for sure, she looked very at home performing on front of guests at Ben and Rachel's big day.
Pixie Lott and Oliver Cheshire at the Fashion Awards 2016 at the Royal Albert Hall
Pixie Lott attends the Virgin Holiday's Attitude Awards 2017 at The Roundhouse on October 12, 2017 in London, England. (Photo by Tristan Fewings/Getty Images)
Pixie Lott attending The Pride of Britain Awards 2017, at Grosvenor House, Park Street, London
Oliver Cheshire and Pixie Lott have got engaged
Oliver Cheshire and Pixie Lott attend the Pride Of Britain Awards at Grosvenor House, on October 30, 2017 in London, England. (Photo by John Phillips/Getty Images)
Oliver Cheshire and Pixie Lott attends the Virgin Holiday's Attitude Awards 2017 at The Roundhouse on October 12, 2017 in London, England. (Photo by Tristan Fewings/Getty Images)
(L-R) Oliver Cheshire and Pixie Lott attend the Lost In Space event to celebrate the 60th anniversary of the OMEGA Speedmaster, which has been worn by every piloted NASA mission since 1965 at Tate Modern on April 26, 2017 in London, United Kingdom. (Photo by Jeff Spicer/Getty Images)
Pixie Lott attends the Good Morning Britain Health Star Awards at the Rosewood Hotel on April 24, 2017 in London, United Kingdom. (Photo by Jeff Spicer/Getty Images)
Pixie Lott during a BUILD Series LDN event at the Capper Street Studio in London
Pixie Lott attends the UK Premiere of "Beauty And The Beast" at Odeon Leicester Square on February 23, 2017 in London, England. (Photo by Jeff Spicer/Getty Images)
Pixie Lott attends The BRIT Awards 2017 at The O2 Arena on February 22, 2017 in London, England. (Photo by John Phillips/Getty Images)
Pixie Lott attends The Championships, Wimbledon, with Stella Artois on July 10, 2016 in London.. (Photo by Jordan Mansfield/Getty Images)
Pixie Lott attending The Fashion Awards 2016 at the Royal Albert Hall, London
Pixie Lott and Oliver Cheshire attend the Schiaparelli Haute Couture Spring Summer 2017 show as part of Paris Fashion Week on January 23, 2017 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
Pixie Lott attends the National Television Awards on January 25, 2017 in London, United Kingdom. (Photo by Anthony Harvey/Getty Images)
Singer Pixie Lott and boyfriend Olivier Cheshire arrive at Nice airport during the annual 69th Cannes Film Festival at Nice Airport on May 14, 2016 in Nice, France. (Photo by Marc Piasecki/GC Images)
Pixie Lott attending the British Fashion Awards at the London Coliseum, St Martin's Lane, in London. PRESS ASSOCIATION Photo. Picture date: Monday 23rd November, 2015. Photo credit should read: Ian West/PA Wire.
LONDON, ENGLAND - SEPTEMBER 28: Pixie Lott attends the Pride of Britain awards at The Grosvenor House Hotel on September 28, 2015 in London, England. (Photo by Gareth Cattermole/Getty Images)
Singer Pixie Lott and her boyfriend Oliver Cheshire arrive for the GQ Men of the Year Awards at the Royal Opera House
Perhaps she's practising for her own?!