Aisleyne Horgan-WallaceToday in Showbiz class we've learnt a very valuable new lesson.

And it's all thanks to Aisleyne Horgan-Wallace.

She's come a cropper in a pair of heels and nearly ended up kissing the pavement.

So, what's she taught us?

That ankles can get tired too.

See, Ash has been snapped leaving Chinawhite in London and her ankle appears to suddenly give way.

We think this must be a case of the tired ankle - that moment when your feet just decide they need a slumber and so your ankle naps.

We've never really seen a case of this before, so we've learnt that on nights out one should always a) have a handsome handler on one's arm to shield a possible fall and b) take note that limbs have a curfew too.

Thank you, Ash.

Now skip off (carefully, mind) and check out Aisleyne and other stars falling over. (And try not to giggle.)