Take That will perform with Robbie Williams as part of a special X Factor performance, according to reports.
Gary Barlow, Howard Donald and Mark Owen 'secretly' signed up to perform together shorty after Robbie joined the judging panel at the beginning of this series.
"Having Robbie on the panel has been a huge coup, but obviously backstage everyone has been talking about whether or not he's going to sing at some point," a source told The Sun.
"It seems a shame to have one of the biggest pop stars on the planet sat there and not hear him, so they've been plotting a surprise for the end of the series.
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"It's a while since they got together and nobody is completely sure when it was going to happen for the anniversary so it'll be a massive moment."
In 2020, Take That will celebrate 30 years since they got together, and Robbie previously spoke about how he would be keen to reunite with his former bandmates to mark the occasion, even if Jason Orange wasn't.
While fans are definitely hoping for a full band reunion, although it's not clear whether Robbie will be involved in the full anniversary tour.
"I'd like to repeat some of that," he said of the potential reunion. "I enjoy working with them.
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"I enjoy hiding in public. I enjoy the camaraderie and I enjoy writing songs with them too, so why not?"
Gary, Howard and Mark begin their tour as a three-piece band in Sheffield next April, but meanwhile Robbie has got some budding musicians to nurture.
On announcing the tour earlier this year, Gary said: "We have a Greatest Hits coming out, we have a few new songs and next year we're doing a Greatest Hits tour."
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Mark added: "It's thirty years this year! We're making a record, we're always celebrating, we've been celebrating for thirty years!"
Featured Image Credit: PA ImagesTopics: Celebrity News, Music Entertainment, The X Factor, Celebrity Entertainment