Ricky confessed to cheating on Jess last year, and Lottie has now insisted she was the other woman involved.
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Speaking to The Sun, Lottie said she didn't know that Ricky and Jess were a couple when it allegedly happened, despite them featuring heavily on The Only Way Is Essex together.
Ricky earlier slammed Lottie, labelling her a 'psychotic lying little sl*g'.
He said: "I wouldn't touch that with a f***ing barge pole… look at the state of it. Just a psychopath liar searching for fame [sic]."
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Now Jess has hit back herself, suggesting that Lottie had previously admitted to lying about the whole thing.
Jess wrote on Twitter: "The fact she msged admitted fabricating it all on TOWIE already!v [sic]"
Jess then claimed Lottie had filmed scenes for the Essex reality show, but she'd been cut when her lies were exposed.
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She added: "The footage was cut cos she made the whole thing up & got caught. [sic]"
Since making the allegations that she had slept with Ricky, Lottie herself has remained silent on the subject.