When I watched her on screen in 'The Tourist' I noticed how beautiful her eye make-up was and instantly opened my beauty box to try it out. Although she has round eyes, she (or her make-up artists) is very talented in making them appear cat-like and elongated but without looking like she's drowning in eyeliner.
The key is to use a damp angled brush dipped in a black eye shadow and building it up on the outer corner of the eyelid. Only use a fine line on the middle - inner corner to prevent rounding the eye.
I learned this from the endless tutorials on YouTube, one of my favourites being this: http://www.youtube.com/watch?v=pxox_MFpy7c - Pixiwoo
No copyright intended, do not claim any photos as my own - Chloé