What is going on with Uma Thurman’s face?

Uma Thurman has made an appearance on the red carpet looking alot different to normal!
Image Credit: standard
She was promoting the US version of The Slap when people noticed her face looked dramatically changed.
Renee Zellweger shocked us last year when she made an appearance looking like a different person but denied having any work done.

Image Credit: pagesix
What do you think? Is this a new beauty regime or has she gone under the knife?