The boys (it should probably be men now, right?) were joined by their gorgeous other halves for the evening.
Ronan Keating's girlfriend Storm Uechtritz looked stunning in a pair of hot pink trousers, which she teamed with a simple black vest and gold necklace.
Ronan has been dating Australian TV producer Storm since 2012. He's been working in her native Aussie as a judge on their version of The X Factor.
He split from his wife Yvonne in 2011 when it emerged that Ronan had had a seven-month affair with a backing dancer.
He's since said: "We were on tour, and when you're in that circle it's a bubble. It's not real ... I was wrong. I tripped up. The pain that I caused people has been devastating."
The former couple are still friends for the sake of their three children, and it's great to see Ronan looking happy again with new girlfriend Storm.
He and the Boyzone crew must have decided it was high time to get together while they were all in London, and looked in high spirits as they left The Ivy.
Mikey Graham was joined by his wife Karen, Shane's wife Sheena was there, and Keith's wife Lisa joined in on the action too.
The boys are back to celebrate their 20th anniversary with a brand new single 'Love Will Save The Day', and their BZ20 tour starts in Dublin on November 28.
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Watch Boyzone's music video for new single 'Love Will Save The Day' below: