Last week, Antony whisked dental nurse Rosanna to Paris as a surprise before proposing to her underneath the Eiffel Tower.
The singer has now confirmed that he and Rosanna, who have been in a relationship for 18 months, are also set to becoming parents together in June.
Announcing their exciting news in the Sunday Mirror, Antony said: "This is the best Christmas present I've ever had.
"I'm going to be a dad with the love of my life."
Antony shot to fame alongside his Blue bandmates - Duncan James, Simon Webbe and Lee Ryan - in 2001 and, behind the scenes, he was occasionally a naughty boy.
The star splashed his cash to the extreme and wobbled close to the edge of bankruptcy, which left him homeless and sleeping on a pal's sofa when the group split in 2004.
In 2011, Antony hit rock bottom when he was caught on camera urinating up against a cash machine close to London's Trafalgar Square during a drunken night out.
"Out of everything that's ever happened that is my biggest regret," Antony said. "The worst thing was that my mum saw the pictures and said, 'I never raised you to do that'."
Antony, who rarely drinks now, added: "I've done some stupid things in my life – I was such a t***. But I am seriously the happiest I've ever been right now."
Antony is already a dad to nine-year-old Emilie, who he fathered with his ex-fiancèe Lucy Bolster in 2003.
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