A source said: "Noel decided after a decade it was the right time to do the romantic thing.
"They are both really looking forward to the big day."
Noel – who has sons Donovan, three, and Sonny, eight months with Sara – proposed to his girlfriend in October, getting down on one knee with an expensive engagement ring from an upmarket London jewellers.
A source revealed at the time: "Noel secretly asked Sara to marry him on her birthday last October. He's not one for making a big scene.
This is the man who kept his leather jacket on when his lad Donovan was born. They have been living like they were married for years anyway.
"He splashed out on a mega posh Solange Azagury-Partridge ring from a Bond Street (London) jewellers. They are madly in love and spend all their time together without any bickering. They are a perfect match."