Ariana Grande kisses her 'friend' Victoria Gillies on her lips, says the post was an accident

Ariana Grande posted a 15 sec video clip on Instagram, of her kissing her 'Victorious' co-star Elizabeth Gillies on the lips while the two are hanging out in a bedroom.  Elizabeth said "It has to be pretty though" and started the countdown of 1,2,3 then kissed Ariana really quick. Ariana Grande captioned it:

"my favorite video of all time @lizgillz. (p.s. this was totally posted by accident)"

More photos after the cut..