Guess who?Guess who?This teenage actress has transformed herself into someone entirely unrecognisable from the cheeky redhead of a year ago - and even from the super-skinny chick of last month...

So just who is this mistress of disguise?

It's none other than Lindsay Lohan - who's done it again.

She's recently been battling against rumours that she has anorexia after her dramatic weight loss - putting it down to her body just changing shape into a woman.

Then went the red hair - instead she sported a very dyed straw blonde 'do.

And now, with dead straight, whitish blonde hair, she looks every inch the Hollywood star.

Sporting scarlet lippy the Mean Girls actress sang at a US radio station's show in California.

She recently revealed that she's taking on the role that Scarlett Johansson has had to reject in Mission Impossible III due to scheduling clashes.

Watch this space for the next new look...