That isn't the photo there, although Lupita does look like slightly taken aback here, like Thompson is mumbling something sinister like "Enjoy it while it lasts, I've been doing this since before you were born!" Or something.
Below is of course the photobomb, where Emma's head sprouts from Lupita's neck. We too initially thought it was Jennifer Lawrence after a night on the tiles, but she's only permitted one major photobomb per awards season, otherwise the other A-listers get jealous.
At the Oscars, you can expect to see Sandra Bullock emerging from Amy Adams' gusset on the red carpet.