Conan O'Brien certainly knows how to set the mood for Valentine's Day on 'Conan.'

In a contest, appropriately called 'Conan's V-D Explosion,' the talk show host had viewers submit videos of them eating a romantic meal. The winners, DJ and Sabrina from Melbourne, Fla., shared Valentine's Day dinner -- straight from Taco Bell -- on stage throughout the show.

And the surprise guest? None other than William Shatner, who delivered a dramatic reading of Rihanna's 'Umbrella,' to the delight of the winners and the audience. Watch the video inside!