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Boyzone performed their first gig in 7 years on Sunday night - and stripped to their pants to show off their new toned bodies.
The group, who will play 32 shows around the UK, have undergone a no-carbs diet and intensive fitness plan to get in shape.
'We have been working out with a fitness coach for 3 months,' frontman Ronan Keating, 31, tells the Daily Mirror.
'The fitness regime got us in such good shape we decided to strip off and show off our new look!'
The boys - including Shane Lynch, 31, Stephen Gately, 32, Mikey Graham, 35, and Keith Duffy, 33 - wowed the crowd in Belfast with a 2-hour set.
The tour has seen them reunite with former manager Louis Walsh, 55.
And of the obvious comparisons to the recent Take That tour, Ronan confesses to The Sun: 'They raised the bar and we had to follow. We had to outsex them.'
See Boyzone in their shorts here>>