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The Bros pop star, 56, is "looking forward" to marrying jewellery designer Chantal Brown after he popped the question.
Speaking at the Barrus X Art De Huile LFW show, he told the Daily Mail newspaper: "We haven't officially put it out there yet, but we're engaged and looking forward to getting married.
"She's going to make an honest man out of me."
Chantal - who was married to EastEnders and Law + Order UK actor Paul Nicholls from 2008 to 2015 - admitted "true love" is the reason her relationship with Matt works.
She said: "True love is the secret to our relationship working out."
The happy couple are to marry in London, but their wedding planning is ongoing.
In May, Matt - who is "completely estranged" from his twin brother Luke Goss - gushed over his "incredible" significant other Chantal, admitting she is his "best friend".
He told OK! magazine: "Chantal is incredible, and she's like my best friend."
Matt admitted at the time that he didn't "really have any support" from his family, other than his father and stepfather, and he feels "somewhat orphaned" by his own blood.
He added: "I feel somewhat orphaned in my family - I feel as if I don't really have any support, aside from my father and stepfather, and it's been that way for quite some time.
"So [to have] someone that feels like your family is beautiful."
Matt lost his 18-year-old sister Carolyn in 1988, when she was killed in a car crash, and his mother Carol to breast cancer in 2014.
The Are You Mine? hitmaker feels "breathless at times" and wishes he could have Carolyn's energy to "bring some glue to this family".
Matt added: "I do feel breathless at times, to be honest. I wish I could have my sister's energy to bring some glue to this family.
"None of us really speak, which is strange. It feels like I don't have a family that gives a s***, and how it's affected me is that with every fibre in my being, I'm putting my best foot forward."