Bob Geldof and Goldie HawnWe didn't have Bob Geldof and Goldie Hawn down as mates.

But apparently the unlikely duo are tight as.

So strong is their friendship, we've given them a lil' nickname - Boldie.

Boldie outed their chum status at the Unesco Benefit Gala For Children in Cologne recently.

As is the way of true buddies, they frolicked about together at the bash - with Bob playfully pretending to strangle Golds (at least we hope he was being playful).

Who knows what a 62-year-old screen legend finds in common with a grungy activist eight years her junior...

A love of charity, perhaps?

Or maybe the unlikely duo discuss the trials and triumphs of having showbiz daughters?

Bob's sprog Peaches is constantly making headlines with her teenage antics, while Goldie's child, Kate Hudson, has a very complicated love life.

Whatever it is that floats this pair's friendship boat, it's clearly deep 'n' meaningful.

Check out the comrades that are, in our gallery of celeb mates, below.