Let this be a lesson to celebs everywhere - if you find yourself near Jennifer Lawrence on the red carpet, be prepared. Emma Watson wasn't and get a faceful of JLaw's palm. The actresses were at the Dior show at Paris Fashion Week on July 7.
Jennifer is a regular menace on red carpets. When she's not tripping over herself, she's photobombing someone else. The last celeb to be JenLawrenced was singer Taylor Swift. So Emma really should have known better.
As it turns out, the Harry Potter star - lovely in asymmetrical monochrome and red lip - saw the funny side. No Expelliarmus charm needed.
This image was posted on Twitter by JLdaily