The couple have been spotted acting rather suspiciously recently, with Charlotte spotted picking up honeymoon brochures near their home in Vale of Glamorgan, Wales.
The singer, who gave birth to daughter Ruby a month ago, has publicly said they have no plans to get hitched.
But pals tell us the couple are dying to tie the knot and make their relationship official ASAP.
Charlotte and Gavin have even been overheard discussing romantic honeymoon destinations.
A pal tells us: "Charlotte can't wait to marry Gav, she's just had his baby and they're getting on better than ever.
"They've never been closer and the icing on the cake now would be for them to tie the knot. She's always talking about walking down the aisle, and her dress, and where she'd love to go on honeymoon.
"Every girl dreams of her special day and Charlotte isn't any different.
"She feels she's met the man she wants to spend the rest of her life with and raise a family with and that's all that matters to her. Friends are expecting an announcement any time now." Celebs and Bubs
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