Take That stars Mark Owen and Robbie Williams gave an impromptu backstage performance of 'Greatest Day', just before taking the stage in Norfolk on Sunday, August 27.

Robbie Williams and Mark Owen sing spine-tingling acoustic version of 'Greatest Day' in backstage video

Robbie Williams and Mark Owen wowed the crowd at Sandringham with an emotional duet of Take That's 'Greatest Days'.

Robbie Williams joined by Mark Owen on stage for emotional Take That reunion at Sandringham concert

Robbie Williams strips off to show his tattoos

Robbie Williams strips naked to show off extensive tattoo collection in cheeky photo

Robbie Williams was performing at the Pinkpop music festival in The Netherlands when he asked his band to stop playing.

Robbie Williams forced to stop performing mid-show due to being 'knackered': "Stop, Stop"

Robbie Williams: British pop's greatest ever showman?

Robbie Williams review: Pop’s greatest showman entertains Isle of Wight Festival with cathartic set of classic hits

The best songs about dads

Father's Day songs: 17 emotional tracks about dads

Ayda Williams, who is currently holidaying with her family on Italy's Amalfi Coast, has uploaded a new video of Robbie and his children – and it may be the cutest yet.

Robbie Williams sings 'Angels' to his kids in beautiful home video

Robbie Williams has made hearts melt with his gesture to a blind fan earlier this week in London.

Robbie Williams dedicates ‘She’s The One’ to blind fan who is brought to tears: 'I feel included and worthy'

Gary Barlow has shed light on how he felt when Robbie quit Take That in 1995.

Gary Barlow opens up about his reaction to Robbie Williams quitting Take That

Robbie Williams in bed, serenaded by his kids

Robbie Williams's kids serenading him in bed with 'Angels' is the cutest thing you'll watch today

The trailer for Take That's musical 'Greatest days' has dropped ahead of the film's release later this summer.

Take That movie musical 'Greatest Days': Trailer, cast, plot, soundtrack and more revealed

Take That's greatest songs, ranked

Take That's top 20 greatest songs ever, ranked

Take That have had some unforgettable moments in their 30 years together

When was Jason Orange's last performance? Take That's most historic moments

Take That and Robbie Williams and Jason Orange

Have Take That just teased a full five-piece reunion "soon"?

The music of Take That is heading to the silver screen in Greatest Days.

Take That to perform live at London premiere of musical movie Greatest Days - watch first-look trailer

'Freedom! 90' was Robbie William's debut solo single.

When Robbie Williams paid tribute to his hero and friend George Michael only days after his passing