Professor Green decided to film Millie Mackintosh working up a sweat in the gym during a personal training session and then post the video on his Instagram account.
Millie has been open about her wedding fitness routine, but we're pretty sure she didn't want things to become quite this public!
The Made in Chelsea star doesn't seem too impressed with her fiancé when she discovers he's filming her weighted squat workout - she even flips him the bird and tries to cover her face.
The Hackney-born rapper posted the short Instavid of Millie on Tuesday along with the caption, "Go on bird give it some!"
The rapper later tweeted, "Definitely gonna be in trouble later. Hats off though she's properly dedicated."
Take a peek at the video below...
The couple, who got engaged in Paris earlier this year, plan to marry next month in a low key event. Professor Green has insisted that non of Millie's old cast mates from Made In Chelsea are not invited. Ouch.
Copy Millie's gym style with these affordable fitness clothes from the high street...
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