Britain's Got Talent will air a special All Stars series this year, it's been confirmed.
Britain's Got Talent: The Champions has been confirmed to air later in 2019, hosted by Ant and Dec just like the main show.
It will see acts from the past 13 years of BGT as well as other Got Talent series from across the world compete to be named the ultimate champion.
Collabro are one of the confirmed acts to be taking part.
The musical theatre boyband won the show in 2014 and have since enjoyed a string of successful albums and tours.
They said on social media: "We can’t wait for you guys to tune in! We had such a great time seeing our BGT family again and meeting our fellow Champions. - The boys x"
The group, who were originally a five piece up until 2016 when member Richard Hadfield quit, will return to the stage when BGT: The Champions from Saturday, August 31.
Other acts for the All Star series are rumoured to include 2012 winner Ashleigh Butler, who secured victory as dog act Ashleigh and Pudsey. Following the pooch’s sad death two years ago, she now performs with his replacement, Sully.
As well Collabro and Ashleigh, other winners signed up are Series 1 champ Paul Potts, George Sampson, who won the second series in 2008, reigning winner Colin Thackery, 2016 winner Richard Jones, 2011 winner Jai McDowall and 2018 winner Lost Voice Guy.
More contestants are roller-skating duo Billy & Emily, comedian Jack Carroll, and music duo Bars and Melody.
International acts will include American comedian Vicki Barbolak, ventriloquist Paul Zerdin, Ukrainian sand performance artist Kseniya Simonova, Danger act, Deadly Games; Alexa Lauenburger and her incredible dogs; and what could be the most terrifying performer yet, The Sacred Riana.
Current BGT judges Simon Cowell, David Walliams, Amanda Holden and Alesha Dixon will make up the panel.
Britain's Got Talent: The Champions begins on Saturday, August 31 running for six weeks.
Ant and Dec will host the series.