The DJ and presenter reveals all the details on some of the A-listers he's met for his Radio 1 breakfast show - and he's rubbed shoulders with the best of them.
"I turned up at Angelina Jolie's hotel suite to do an interview and she looked at me like I'd just come into her house uninvited. She's so cold," says Grimshaw.
Maybe she was just doing her icy Maleficent thing? Ange, aka the actress, goodwill ambassador and mother of six, "cold"? Surely not.
"I don't like fake nice either. Will Smith is fake nice. I loved Miley Cyrus who just came into the studio and started burping," he goes on to say.
Grimmy is also famed for being best friends with Kate Moss, who has also appeared on his Radio 1 show: "Kate was the one who came up with the idea for Call or Delete when we were on holiday together,' he says.
"Kate came on because she knows that I'm not going to suddenly say, "Tell us what you think about being really thin and a role model."'
While Grimmy has a huge celebrity clique of friends he says he's still like the rest of us when it comes to meeting the stars, "I'm still genuinely fascinated with celebrity culture."
Read the full interview in Friday's ES Magazine and online here.
LOVE ANGE'S ELEGANT STYLE? Take a look through this gallery to see more looks from the actress.