Sam Faiers claims she has proof that Mario Falcone has cheated on fiance Lucy Mecklenburgh on this weekemd's show.
Speaking to Lauren Pope, Sam reveals: “I know for a fact that Mario has cheated on Lucy, but when I tried to tell her the other day, she didn’t believe it.”
The blonde beauty explains: “My cousin has a best friend that has slept with Mario.”
“You 100% know that he’s cheated?” asks Lauren
“Yes. If she wants proof there is proof. I can get proof anyone can get proof, but she doesn’t want to know," Sam replies.
Sources previously claimed that Lucy was "really upset" by the rumours of Mario's cheating.
"She gets really upset" an insider told Heat. "She loves Mario like crazy. There are loads of wannabe glamour models who come back time and again.
"But she does love him... Lucy's said, 'If someone shows me a text that makes me realise I'm being naive and silly, then fine'.
"But she trusts him and she's got access to his Twitter, phone, the lot."
The Only Way Is Essex continues on Sunday night at 10PM on ITV2.