The British singer was linked to Lohan last year (12) after a night of partying in New York, which ended with the Mean Girls actress' arrest on suspicion of assaulting a fellow club-goer.
She even met his parents after spending the New Year (13) in London, but at the time George insisted reports of a blossoming romance were false.
However, the hunk has now confessed their relationship wasn't purely platonic.
When asked by E! Online if he had "snogged", or kissed, Lohan, he coyly replied, "Yes, we did - a little one."
He then added, "She's a friend of all of ours and she is a lovely girl. We wish her all the best wherever she is."