Vampire Diaries 'Memory Lane' preview?

I'm confused. Okay, so, if you go on the cw website, there's a longer preview for next week's episode of Vampire Diaries 'Memory Lane'. In one part, it shows Elena playing pool, and Damon comes up behind her and kisses her. Is it Katherine or Elena? I'm about 99% sure it's Elena because her hair is strait and she's wearing the same shirt, but it confused me when Damon kissed her and she laughed. What do you think?