Parkinson has revealed that the Star Stories actor surprised her with the proposal after a long day on set for the Channel 4 sitcom.
The actress told The Sun: "I can’t talk about anything else, I’ve become one of those women who thrusts her engagement finger out all the time.
"I got back from recording an episode and the box was on the kitchen table. Even though I had a terrible migraine it was nice and he managed to surprise me."
The TV star added: "Of course every heart of The IT Crowd crew cracked when I told them on the Monday...No, they’re all very pleased for me."