Emmerdale spoilers follow.
Emmerdale's Moira Dingle has uncovered Caleb Miligan and Tracy Robinson's scandalous affair.
Moira caught the secret lovers in a compromising position in the show's Christmas Day episode.
Emmerdale bosses had previously confirmed that someone would rumble the affair, but the revelation that it was Moira was kept back until transmission.
The show's Christmas episode saw Caleb and Tracy spend the day together at Butler's Farm after being invited by Moira and Cain.
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Tracy attended the festive celebration with her husband Nate, but she secretly enjoyed flirting with Caleb whenever they got a moment alone.
When everybody else needed to be elsewhere, Tracy and Caleb offered to stay back and look after the kids.
Away from prying eyes, Tracy and Caleb made the most of their time alone as they gave into temptation while the kids were upstairs.
Tracy eventually pulled away as she struggled with the guilt of betraying Nate while their daughter Frankie was in the house. However, she was soon won over by Caleb again when he presented her with an expensive Christmas gift.
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This proved to be a risk too far as Moira walked in and was appalled to spot the pair kissing passionately.
A furious Moira had only one question to ask: "What the hell are you doing?"
This discovery is now certain to spark a major dilemma for Moira over the rest of the festive period.
Moira's family loyalty to her stepson Nate is sure to play heavily on her mind, as well as their own complicated history. But can Caleb and Tracy find a way to keep her quiet?
Emmerdale continues on Boxing Day at 7pm on ITV1.
Emmerdale airs on weeknights at 7.30pm on ITV1, and streams on ITVX.
