Speaking exclusively to DS, the Radio 1 DJ remained adamant that the pair are just friends.
"There's nothing going on with Pixie Geldof!" he said. "She's a good friend of mine, but there's nothing romantic [going on]!"
In 2007, the former E4 presenter was linked to Geldof's sister Peaches and was later rumoured to be involved with Jude Law's ex-wife Sadie Frost.
> Click here for our recent interview with Nick Grimshaw