The birthday girl shared a picture of herself alongside X Factor judges Mel B and Simon Cowell as they flew to Edinburgh for the next leg of audtions.
Oh and Simon Cowell was forced to don a party hat as part of the festivities. Looking suave, sir.
She captioned the fun snap: “Birthday selfies on the way to Edinburgh, yes. That is Simon in a blue party hat #blame @officialmelb.”
It is fast looking like Mel and Cheryl are becoming the thorn in Simon’s side with his alleged plan to pit the two against up each other spectacularly backfiring.
The 39-year-old former Spice Girl tweeted BFF Cheryl her birthday wishes via the medium of Twitter (where else?) writing: “Happy birthday my lovley @CherylCole see ya later on the jet for bday drinks yipppppee hope you have been treated like a princes all day xxx”
Cheryl revealed recently that although the scary judge’s style of critiquing X Factor hopefuls is the polar opposite to hers, she has been finding working with Mel a fun experience so far.
She admitted: “I admit we are very different characters and very different people.
“But it works. She actually makes me laugh.
“Sometimes I have to stop myself laughing at her because it’s really rude — the contestants think I’m laughing at them.
“She’s quick and she’s very direct. A lot of the stuff she says I couldn’t bring myself to say. But I love that — it’s a good dynamic for the panel.”
Meanwhile, Simon attempted (and failed) to send a humorous tweet ahead of Cheryl’s big day, writing: “Now what shall I get Cheryl for her birthday tomorrow? 40 is an important year.”
[Cheryl Cole recieves 310 roses for her 31st birthday]
[Cheryl and Simon splash out on a chinese takeaway]