The 32-year-old singer - who is one quarter of the British boy band alongside Duncan James, Lee Ryan and Simon Webbe - popped the question to his girlfriend Rosanna Jasmin today (23.12.13), which is also her birthday, while on a romantic getaway to Paris, France.
A statement on Blue's official Facebook page reads: ''It is with great pleasure we are pleased to announce the engagement of Antony Costa and his beautiful girlfriend Rosanna. Antony surprised Rosanna on her birthday today with a visit to Paris where he asked for her hand in marriage and she happily said yes.
''Everyone in Blue and the entire management team wish both Rosanna and Antony the very best for the future and we are all looking forward to the wedding.''
Rosanna gushed about the news on her Twitter page, sharing a snap of her and Antony under the Eiffel Tower.
She captioned the picture writing: ''We're Engaged!!!!!!!!! (sic)''
Antony also thanked fans of the 'One Love' group for their influx of congratulations.
He tweeted: ''Thankyou for your lovely messages myself and @RosannaJasmin are so happy to announce our engagement!!! Bring on 2014 xxx (sic)''
What's new in the music world this week?
'Sounds of Silence' was released on this day (January 17th) in 1966.
Listen to Alex Bayly performing 'Animal'.
Two weeks ahead of Independent Venue Week, Dry Cleaning made 'Britain's Best Small Venue 2015' (NME) the second port of call on their 2020 tour.
'Leave Home' was released on this day (January 10th) in 1977.
For their last gig of the year, The Libertines came back to their adopted hometown of Margate to finish off their latest tour.
Celebrating the birthday of David Bowie with his most legendary songs.