The radio DJ posted a photo to his Instagram page alongside Kate and husband Jamie Hince, who came dressed as Rita's boyfriend Ricky Hill.
He captioned it with: "Out with my hubby and my wifey @caradelevingne."
Grimmy presented an awards ceremony with Rita earlier on this year, and after posting an Instagram snap of him posing in her
sunglasses and hat, it appears he wanted to try on the rest of one of her scantily clad outfits...
Kate Moss, dressed as fellow supermodel Cara, did an excellent job at perfecting the 22-year-old's famous gurn. We had to do a doubletake to check that wasn't THE actual Cara Delevingne.
The showbiz pals were attending chat show host Jonathan Ross’s legendary annual Halloween bash.
Other celebs in attendance were Mel B (dressed as a cat) and Jimmy Carr who came as Wednesday from The Addams Family.
We can’t wait to see pictures of Jimmy Carr’s costume! He could potentially out-do Grimmy’s winning get up…
Jonathan Ross Halloween bash
1 of 11Stephen Merchant
2 of 11David Baddiel
3 of 11Jodie Harsh
4 of 11Jack Whitehall as Jafar
5 of 11David Mitchell
6 of 11Adele
7 of 11Frank Skinner
8 of 11Nick Grimshaw and Kate Moss
9 of 11Kate Moss as Cara Delevingne
10 of 11Jimmy Carr and Karoline Copping
11 of 11