Beyonce rejected a song Chris Martin wrote for her because it was "awful".
The Formation singer and the Coldplay frontman are good friends and Beyonce recently collaborated with the group on the single Hymn For The Weekend.
She also guest-starred during Coldplay's recent Super Bowl halftime show along with Bruno Mars.
But Martin admitted that when he presented Beyoncé with a song he penned for her, she was brutally honest about it.
Speaking about her reaction to the track called Hook Up, he said: "She turned it down in the sweetest possible way: She told me, 'I really like you - but this is awful.'"
Martin also revealed that he and Gwyneth Paltrow - who split in 2014 - have a "wonderful separation-divorce" and are still very close.
He said: "I have a very wonderful separation-divorce. It's a divorce - but it's a weird one. I don't think about that word very often. I don't see it that way. I see it as more like you meet someone, you have some time together and things just move through."
Meanwhile, Martin also revealed he loves the Rocky movies and takes diet inspiration from the fictional boxer.
He told Rolling Stone magazine: "Rocky IV has the most awesome training sequence of all time. I think it triggers the young boy in me who saw it and was like, 'Wow - if you wanna do something, just lift logs!' If Rocky eats it, I do, too."
- Bang! Showbiz