Kaley Cuoco and Fiance Ryan Sweeting "Get Married" on The Ellen DeGeneres Show in Impromptu Ceremony By Nevel

If fans thought Kaley Cuoco got engaged to tennis player beau Ryan Sweeting quickly, just wait until they see her impromptu wedding ceremony on The Ellen DeGeneres Show! The Big Bang Theory star, 27, appeared on the popular talk show on Nov. 7 to talk about her engagement and Ellen DeGeneres, 55, quickly suggested she get married on the show, using one of her writers who had been ordained.

"I even wore a white dress!" Cuoco declared after DeGeneres pulled out a veil and costume jewelry for the bride.

 Cuoco's fiancé, 26, seemed a bit hesitant as DeGeneres ushered them quickly to the altar, saying, "This isn't legal, right?"

The comedian offered up her own wedding rings for the bride and groom and the ordained writer sped through the vows before declaring them man and wife. The couple sealed the momentous occasion with a kiss.

It's unlikely that they were actually married on the show, but Cuoco said she knew that Sweeting was the one early on.

"By Day 2, it was so unbelievable, I said, 'This is it,'" she told DeGeneres. "I know it looks a little crazy to some people."