Fans of the Essex-based reality show were surprised to see Chloe and Mario enjoying a cheeky snog while on a night out on 18 March.
Since then, it's unclear if anything else has happened between the pair, although do you reckon these photos taken at Saturday night's TOWIE boxing match suggest Chloe is definitely interested?
Chloe was seen placing a hand on Mario's arm as she whispered into his ear, while he appeared to be listening intently - and keeping an eye on the action in the ring! They were in Romford to watch co-stars Elliott Wright and Lewis Bloor slug it out in a boxing match.
Okay, it's not quite making out in the street, but is it a sign there could possible be a new TOWIE romance in the pipeline?
On Sunday night's episode, viewers saw a giggling Chloe chatting to Ferne McCann about her kiss with Mario.
She said: "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."
Meanwhile, Chloe's brother Charlie Sims – who is (awkwardly?) Mario's best friend – has said he doesn't know what's going on.
"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."
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