Yeah it is definitely them interesting to note though that not one media outlet has reported them as to being at the party and no other photos of them have been shown of them at the party. It is noticeable though that it is yet another event that they attended without Archie and Lili they never seem to be with them.
Despite the blurred pix, its definitely her.
The image of Harry is interesting though. It looks like he has a hair parting on the left side and rather a lot of hair on the right side.