Having already been embroiled in drama with Stephanie Pratt this series, it looks like more drama is just around the corner for Lucy.
In a new trailer, producers tease: "Lucy's refusal to accept anything less than the truth leads to an uncomfortable revelation."
Next Monday's episode sees Lucy confront James following a conversation with Sam Thompson, where he says James hasn't been truthful to her.
Sam says: "This is going to sound awful, I don't know if you're going to understand this. People do, in relationships, tell white lies to people unfortunately. James does it to you."
Lucy asks Sam: "What are you saying he's lying about?"
And he blurts out: "It just happened."
Another scene sees Lucy confront James - and she is not happy. She tells him: "It makes you look shady now that you've lied for all these months. I didn't think you'd ever lie to my face."
What on earth could it be? Or is it just a misunderstanding?
Made In Chelsea - Mondays at 9pm on E4
Watch a trailer below:
Try Reveal's digital edition on iPhone & iPad. Subscribe now & never miss an issue!