Hands down would be Megan Fox! I love the way she (or her MUA) does her make-up. It's stunning and flawless every time... and natural. I'm not one who can pull off heavy make-up (especially eyes) without looking like a clown or a drag queen... so Megan's make-up style is one I hope to emulate when I have time.
I love how she plays up her eyes with enormous lashes and plays up her lips with beautiful colors. Over all in my mind her make-up style is perfect!