The most epic celebrity selfie of all time?!

One thing we never thought we would see Simon Cowell donning is the good old-fashioned party hat!

However, we underestimated his love for Cheryl Cole, and he wore one for her birthday celebrations that were held on a private plane, of course.

Cheryl uploaded the hilarious selfie to her Instagram account with the caption: “Birthday selfies on the way to Ediburgh. yes. That is Simon in a blue party hat #blame @officialmelb.”

Meanwhile, Simon tweeted a very cheeky message wishing the star a happy birthday: “Now what shall I get Cheryl for her birthday tomorrow? 40 is an important year.”

Ooh, Simon, we’re sure she was VERY impressed with that!