One itchy bumOne itchy bumSomeone is having a good ol' scratch of a private part.

And unluckily for them, they're being followed by a pap.

Don't be coy peeps.

We've all been there - it starts off tickly and then gets more and more creepy...

Until it's just plum unbearable.

And there's only one way to stop it.

You've just got to dive right in there and have a good itchy, scratch.

Just ask Mischa Barton - it seems that even A-listers get caught out by the dreaded botty niggle.

And in public too.

Have a gander at Mischa Barton and her irritated posterior, and check out all the other itch-tastic celebs in our gallery of itchy and scratchy celebs.