The former Bachelor star and Catherine Giudici, who tied the knot on Sunday, vowed to stay celibate until they wed.

Yet, Jimmy Kimmel didn't believe their wait to consummate and asked the couple to take a polygraph test on his talk show last week.

"Sean and Catherine have stated publicly that they would not have sex before they were married and they got engaged more than a year ago," Kimmel said. "I found that hard to believe."

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The host then explained that they had a professional polygraph examiner Dennis Blackstock perform the lie detector test.

Footage shows Sean and Catherine both saying that they did not sleep together throughout the time they dated.

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Blackstock later revealed that he has a "definitive" result, which means he has close to a 100 percent certainty. The results show that Sean and Catherine were both telling the truth about their relationship.

"Wow," Kimmel said. "I have to say I'm proud and disappointed at the same time."

The love birds got engaged on The Bachelor last spring and said "I do" on Jan. 26 in a ceremony that aired live on ABC. Sean and Catherine recently spoke about their decision to wait till they were married in an interview with In Touch magazine.

"I think we know each other a lot better now," Lowe said. "You have to work at being in a healthy relationship, which we have done, and we both know why we're great for each other."

His lady had similar feelings toward him and also expressed her excitement for the big night.

"Since I met him, I have always been attracted to him... but every day I've gotten to learn more and more about him; it's kind of like we've merged into one inseparable person," Giudici said. "I can't wait to solidify that bond!"

Tags: Sean Lowe and Catherine Giudici