Fans of the Essex reality show were surprised to see Chloe and Mario enjoying a passionate snog in the street after an evening partying in London on 18 March.
And on last night's episode, the smooching was addressed.
A giggling Chloe told Ferne McCann: "It just happened. He kissed me – and it was a really good kiss!"
When quizzed if that had been their only kiss, a coy Chloe replied: "One kiss that we got caught for! It's been a secret but I feel like I just want people to know now so it can not be a secret and we can see what happens."
See what happens?! Hmm... a possible new TOWIE power couple?
Ferne found it all quite funny, especially because Mario imposed a celibacy vow on himself earlier in the series and his best friend Charlie Sims – Chloe's brother – has been trying his hardest to ruin that.
She said: "What makes me laugh is Charlie's been trying to break this celibacy vow and his sister comes along and does it in one night!"
Charlie, meanwhile, admitted to Dan Osborne and James Lock that he honestly wasn't sure what was going on between Mario and Chloe.
"I don't f**king know what's going on there. I just came to terms with my best friend and sister snogging each other, like, what the f**k is going on there?! I said if you like her there is nothing I can do with two people liking each other. I'm not here to tolerate my sister being mucked around. Not just by Mario, but any geezer."
Chloe hasn't addressed the kissing via Twitter, but Mario tweeted a message last night suggesting Cheryl Cole pay him a midnight visit to celebrate the end of his celibacy vow, suggesting he didn't count the Chloe kissing as breaking it.
TOWIE airs Wednesdays and Sundays on ITV2.
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