Keith Duffy, Mikey Graham, Ronan Keating and Shane Lynch arrived at the RTE studios to pre-record Gay Byrne's 'One Night Only' in celebration of their career milestone.
The 90s boy band no doubt performed their classic pop hits including 'Words', 'No Matter What' and 'Love Me For A Reason', and remembered the late Stephen Gately, who died in 2009 while on holiday in Majorca.
The lads looked dapper, as they dressed up in black suits for the momentous occasion, marking 20 years since they first shot to fame on Ireland's biggest television show, The Late Late Show in 1993.
As expected, the band couldn't wait to get back on stage together and excitement built up for lead singer Ronan, who has also enjoyed measurable success as a solo artist.
He tweeted this week (11 June): "V excited to be back with @officialkeith @mrmikeygraham @shanelynchlife tomorrow. Gonna be epic. Missed me Boyz."
Boyzone are now gearing up to perform a series of gigs as part of a special anniversary tour. Named, 'BZ20: The 20th Anniversary Tour', Ronan, Keith, Shane and Mikey will take to the road to belt out their chart-topping hits and ballads for fans.
They'll kick off their concerts in Dublin on 28 November, taking it to cities including Birmingham, Glasgow and London before bringing it to a close on 22 December in Manchester.