Gary Barlow says Take That will put in an appearance or two when the musical featuring the group's songs arrives in the West End.
The group joined the cast of The Band on the roof of the Theatre Royal Haymarket to perform a trio of hits and release bunches of colourful balloons.
The musical, written by Tim Firth and featuring the music of Take That, follows five 16-year-old girls who are devoted to a boy band and who reunite 25 years later to try to fulfil their dream of meeting their heroes.
The show is on a nationwide tour before it arrives in London and Take That have already made a handful of surprise appearances at different venues since it opened at the Manchester Opera House in September 2017.
Gary Barlow joked: "Tickets are more expensive for the ones when we are not here," before adding: "I'm sure we will be here a couple of times."
'The Band' will run at the Theatre Royal Haymarket from December 1 to January 12 2019. Tickets are on sale now.