Naughty Boy has Beyoncé's number saved under an alias in his phone - incase he loses it.
The producer worked with the pop queen on new track 'Running' and revealed they've "been texting" back and forth ever since, but he's terrified her digits will fall into the wrong hands.
He told The Sun newspaper: "We've been texting. I've been texting her as well. She's so lovely. I've got her as an alias in my mobile in case I lose my phone."
And the 30-year-old songwriter - real name Shahid Khan - admitted he was flattered that the beauty agreed to work with him because she didn't "need" to.
He said previously: "Working with Beyoncé is amazing. She's very spiritual. She doesn't need to feature on a Naughty Boy song, but the fact she has is just testament to her."
Meanwhile, Beyoncé isn't the only singer he's been collaborating with.
He added: "I've done a song with Natasha Bedingfield from my new album. And I'm really excited about that.
I love the fact that people remember her. I'm working with Keiza too for my pop album."