Despite rumours that they'd split last month, new reports say the model is set to marry the former Gladiator.
According to The Sun, Kelly was left "dumbstruck" by his proposal but said "yes!" immediately.
A source told the newspaper: "It's still a closely guarded secret and came to Kelly as a massive shock.
"But she is at that time in her life now where she wants to make a commitment and she has fallen head over heels for David."
Kelly, 34, and her muscle mountain beau got together on New Year's Eve at Kelly's restaurant Steam & Rye. They went public with their relationship shortly after on a number of dates in London.
Super-buff David is a former Royal Marine and was known as Tornado on the TV show Gladiators. He is said to have popped the question while the couple were planning a romantic trip to Dubai.
David has a son called Logan from a past relationship with former Ms England Rachel Christie. Kelly, meanwhile, has had several high-profile relationships with Thom Evans, Danny Cipriani, Jason Statham and Billy Zane.
If the news is true, we think Kelly and David make a FIT couple!
On Thursday, Kelly tweeted: "International Day of Happiness – it certainly is." Is there something you want to tell us Kelly?
Do you think Kelly Brook and David McIntosh make a cute couple? Tell us below!
Check out the celebrity couples who have got engaged in 2014:
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