How many stars can you spot in this advert for Op clothing company?!

OK, so here's the picture... it's full of famous people but how many do you recognise?

One, two, three? How many did you get right?

Let's go through the piccie and see...

From left to right...

Bow Wow and Solange Knowles!

Then Cody Linley from Hannah Montana and Sophia Bush from One Tree Hill

Surely you got the fittie Brody Jenner from The Hills and AnnaLynne McCord from 90210?

And did you see Joel Madden on the end?

How many did you get?

Click next to find out why all the celebs got together....