Host Tracy Morgan and Psy entertained the crowd when they engaged in a dance-off Sunday at the 2013 Billboard Music Awards at the MGM Grand Arena in Las Vegas.

Morgan appeared onstage in a yellow suit, black hat and sunglasses and got Psy to participate in a spontaneous dance duet before Morgan introduced Chris Brown, who performed his track Fine China.

This was the first major hosting gig for the SNL alum and former cast member of 30 Rock. Morgan was an original cast member of the NBC hit comedy series, which closed its doors in January after seven seasons.

It was the end of an era for the actor and comedian, but he is welcoming a new beginning.

Morgan, 44, and his model fiancée Megan Wollover, 26, are expecting a child this July. This is the fourth child for Morgan and the first for Wollower, according to People.

Morgan has three grown daughters and said he hoped to have a baby daughter one day, in an interview with Rolling Stone.

He announced his engagement on the Emmy red carpet in September 2012 and told Ryan Seacrest the two got engaged six months prior in San Francisco.

The Korean rap sensation Psy has developed a reputation in the U.S. for his humorous videos and stage performances.

Psy recently posted a video of himself giving morning-show hosts Kelly Ripa and Michael Strahan a lesson in doing the Gentleman's Dance, his latest dance craze. It attracted more than 1.1 million views in a week.

It began as an offhand request earlier this month during a PSY appearance on Live when Kelly asked if she and her co-host could dance in his next video.

He suggested they make a cover of Gentleman right then and there.

"Let's upload it to YouTube and let's see what's going to happen," he said.

The 41-second clip picked up half a million views in the 72 hours after going up on to the top of Psy's YouTube page last week.

The singer is back as a guest on Live Monday, May 20.

Tags: psy 2013 Billboard Music Awards 30 rock snl Tracy Morgan