Britney Spears appeared on the "The Ellen DeGeneres Show," but little did she know that she is in for some Korean treat. Psy, the Korean rapper who popularized a dance craze paid a visit and taught Britney and Ellen how to do the "gangnam style."

During her appearance on Ellen DeGeneres yesterday, together with fellow "X-Factor" judge, Simon Cowell, Britney Spears received an unexpected dance lesson from Korean artist Psy himself.

From the episode yesterday, Britney and Ellen were game in mimicking the K-pop rapper's popular dance moves. Famously known as the "gangnam style," Britney and Ellen followed Psy's lead.

"@TheEllenShow and I learned how to go Gangnam style from the master today! @psy_oppa #BritneyDoingGangnam," Britney tweeted after to her millions of followers.

The horse-riding dance moves was introduced by Psy on his music video and in only a short span of 2 months, it has earned a whooping 150 million views on YouTube.

Britney who was on the show with Simon Cowell told Ellen how nervous she was to be a judge on "The X-Factor."

"You have all these people behind you and you know they're rooting you on," said Spears. "It's really exciting, electric thing to do. But you know after we got out there and the cast is amazing. Demi and L.A. are great. And we had fun. We had a lot of fun."

Meanwhile, Simon recalled how surprised he was to see Spears say "No" so quickly to contestants. Simon also added that Khloe Kardashian is on the running to succeed Steve Jones as host for the season two.

"It could be a Kardashian. I think that would work. We have to find people who have a great chemistry, but Khloé is definitely up there in running," Simon revealed.

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