AceShowbiz - Kevin Hart appeared to have attempted to show off his singing skills in front of a packed audience. The "Fatherhood" actor hilariously popped up at Usher's concert trying to deliver a song onstage.

Recently, the R&B icon entertained his fans at his show, which was a part of his "Usher: Past Present Future" tour. When he was not on the stage, his comedian friend Kevin took his place. Kevin confidently walked to the center of the stage and carried a standing microphone.

Once he got closer to the audience, Kevin took off his sleeveless white top, proudly flaunting his toned abs. His unexpected move prompted concertgoers to scream out loud and laugh. He then told the concertgoers that he was "about to sing." He exclaimed, "Let's f**king go!"

Kevin began to sing Usher's song "Nice & Slow", "It's seven o' clock on the dot/ I'm in my drop top, cruisin' the streets, oh yeah." In the meantime, Usher was walking towards Kevin, who was sporting a similar outfit to that of the singer.

Kevin turned around and asked, "What the f**k are you doing?" acting as if Usher disturbed his show. Usher replied, "What the f**k are YOU doing?" Kevin said, "B***h I told you I'm about to come up here and sing a song."

In response, Usher stated, "I said no!" Confused, Kevin said, "I thought you said go. I thought you said go," leading Usher to shake his head. Meanwhile, the concertgoers were bursting into laughter while watching the two famous figures arguing on the stage.

Usher insisted, "No, I said no!" Kevin reiterated, "B***h I thought you said go!" The comedian went on to hint that he did not want to get off the stage since he "took my shirt off." He demanded Usher to let him "finish the song."

Despite Kevin's request, Usher told the actor to leave the stage. While walking away, Kevin sang the lyrics before saying, "You're so f**king jealous. You know what they wanted. They wanted this, n***a!" referring to his abs.