In a recent raucous version of "Spill Your Guts Or Fill Your Guts" on CBS' The Late Late Show with James Corden, the talk show host proved that he wasn't afraid to name names when it comes to calling out bad behavior by celebrities. But how did Corden react when game partner Khloe Kardashian dared him to name the worst "Carpool Karaoke" guest ever?

The Late Late Show with James Corden Clips And Games

By now, almost everybody knows about the wildly popular "Carpool Karaoke" segments on James Corden's late night chat program The Late Late Show. The famous sing along car rides are among the most viewed videos on YouTube, with well over 1 billion views and counting for the 23 segments filmed thus far.

Last year's most viewed viral video of all was Corden's ride with singer Adele, and the show is soon set to become a separate series spinoff on Apple TV, with Corden still on board as a producer, but not as host.

While the "Carpool Karaoke" clips may be the most popular from Corden's show, there are a bunch of other regular rotating games and bits on The Late Late Show, one of which is the aptly titled "Spill Your Guts Or Fill Your Guts." In the segments, Corden competes against a celebrity guest, as one alternately dares the other to either answer a revealing question or eat a disgusting food.

Corden's Truth Or Dare

This time it was Kardashian sister Khloe in the hot seat. When challenged by Corden, Khloe admitted that her least favorite show on the E! network was Rob And Chyna, starring none other than her brother, but then chose to eat a fish eye rather than tell whether or not she believed "OJ did it."

When Khloe asked Corden who was the "rudest celebrity", Corden almost balked as he worried that the show might be trying to book the star for an appearance. However, when Kardashian pointed out that if the person was rude, Corden shouldn't even want him on the Late Late Show, Corden admitted it was Pierce Brosnan, who had pushed him at a concert.

Then it came time for the big reveal of another celebrity name when Khloe asked the million-dollar question: Who was the worst singer ever on "Carpool Karaoke?" Corden looked pained as he paused and considered whether he'd want to answer, ultimately deciding that it would be "unfair" to do so and instead electing to chow down on a chicken foot.

It was clear however, that Corden did have a name in mind, and our money is on Britney Spears, who herself characterized her appearance on "Carpool Karaoke" as "awkward" in a later interview, in which she called Corden "the guy," confirming Corden's producing partner Ben Winston's suspicions that the ditzy dance diva hadn't even seen "Carpool Karaoke" before actually filming it.

You can watch the entire segment of "Spill Your Guts Or Fill Your Guts" featuring James Corden and Khloe Kardashian below.