Watch Cara Delevingne + Emilia Clarke have an 'Eyebrow-Off'.

Both Cara Delevingne and Emilia Clarke are well-known for their incredible eyebrows - but whose brow game is stronger?

On a recent episode of 'The Graham Norton Show', the pair dueled it out in a hilarious 'Eyebrow-Off' competition to decide who was the ultimate brow babe. 

The girls also share the number one eyebrow maintenance tip passed down from their mothers: Don't touch them!

Check out the video below to see who emerged victorious...