Hosts Holly Willoughby and Phillip Schofield planted a spooky witch by the main doors of the set, in an effort to frighten visiting celebs.
Once the stars walked through the main door, the witch jumped out of a box, frightening anyone in her path.
Unfortunately for Christine, she had no idea what awaited her behind the door as she arrived to film Loose Women.
As soon as the witch burst out of the box, she screamed “f***”.
Immediately afterwards, she apologised, saying “I’m sorry, I shouldn’t have sworn”, before adding “that was not funny”.
Christine wasn’t the only celeb to accidentally swear on TV – Chizzy Akudolu bellowed the same curse word when she laid eyes on the witch.
Walking through the doors, the Loose Women star screamed “What the f***!” before asking: “Why did you guys do this to me?”
This Morning continues on weekdays at 10.30am on ITV.