Lottie Lou crashed out of the talent show at the weekend after a dreadful audition, and decided to cash in on her 15 minutes of fame.
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The Essex wannabe insisted she was the girl Ricky cheated with last year, before coming clean to girlfriend Jess.
She told The Sun: "I'd seen them on TV but they say that on TOWIE scenes are created for the show. So I didn't know if they were together or if it was just for TV. We started getting to know each other better and things went from there."
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But Ricky has furiously denied her claims, labelling her a 'sl*g looking for fame'.
After hearing Lottie's claims she'd slept with him, Ricky tweeted: "No she f***ing didn't the lying little slag.. She's a psychopath that needs locking up [sic]
"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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"The girl is a scum bag lier psychopath that needs putting down. Vile desperate piece of scum [sic]."
In a less-explicit statement, Ricky's made a statement to the Daily Star, via his agent, saying: "I would like to confirm that I've never had an affair or in fact slept with this fantasist, this story is entirely false and untrue."