They've managed to keep the truth about their son from all of their loved ones, but Ridge (Thorsten Kaye) and Caroline's (Linsey Godfrey) perfect lie about Douglas's paternity will begin falling apart on The Bold and the Beautiful.

Their only prior loose end that could expose the truth about Thomas (Pierson Fode) having fathered the baby was Brooke's (Katherine Kelly Lang) knowledge that Ridge had a vasectomy in Paris, which he quickly covered up with a story about getting it reversed by another doctor. Since then, there haven't been any reasons for anyone to suspect anything. However, the couple forgot to cover their tracks when it came to the doctor who told Ridge he couldn't get his vasectomy reversed because it wouldn't make a difference in his ability to father a child. And now, that doctor is threatening to spill all.

"If Caroline's child is really yours, you have nothing to hide," he says to Ridge in a preview clip for the Thursday, April 14 episode.

However, Ridge won't take kindly to the doctor's threats to expose the truth, and will warn him that he's messing with the wrong person.

"You bring it up again, you're going to see a side of me you'll wish you never had," he says in the clip.

However, what Ridge won't count on is that his argument with the doctor will be seen by someone unexpected, as Katie (Heather Tom) and Bill (Don Diamont) enjoy a nice lunch together at the same restaurant. And after Katie sees Ridge argue with the doctor, she will approach the other man once Ridge leaves-and she will be shocked when the doctor drops the bombshell truth that Ridge can't be Douglas's father on her.

"Ridge is not Douglas's father? Someone else is?" Katie asks in the clip.

The Bold and the Beautiful airs Monday-Friday at 1:30 p.m. on CBS.

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The Bold and the Beautiful, CBS, Soap Operas