Showing no signs of distress from his recent break-up, Prince Harry "twerked" on the dance floor at a "wild and crazy night" in the US city of Memphis to celebrate the wedding of a close friend.
Prince William too had a blast at the party to celebrate the wedding of Guy Pelly as he took to the microphone in full morning dress and belted out "Shout" from the stage.
The Duke of Cambridge was the "life and soul of the party" as he entertained the crowd with his singing and dancing, according to onlookers.
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Prince Harry, newly single after his split from Cressida Bonas, 25, showed off his moves exuberantly but was "just having fun" and did not appear to have found a new love interest among the women at the party, The Telegraph reported.
Jimmy Church, singer with the Jimmy Church Band, which played for five hours at the reception at Memphis Hunt and Polo Club, was quoted as saying: "The whole thing was unreal man. William came up on stage in his coat, and me and him were going back and forth doing 'Shout' and then he did it on his own. I was getting down, he was getting down, it was wild man. He was great, he just got the music."
"They were holding people up in the air and passing them around like they were flying. I've been doing this 50 years and I ain't ever seen anything like this. These guys know how to party," Church said.
"Harry was dancing and having fun, dancing with lots of people. There were lots of girls around him but I didn't see that he was with anyone. He was actually a little more conservative than William," he said.
The band finished off with "Don't Stop Believing" after 1am. But the Princes resisted the temptation to join a group of guests including their cousin Princess Eugenie, and friend Tom "Skippy" Inskip, at a bar in the Peabody Hotel where the party went on until 3am.
At the ceremony itself Prince Harry had looked somewhat weary following a US trip that had already included partying at a nightclub in Miami and a trip to Graceland.
At one point he put his hands on his hips and yawned extensively, the report said.
While female guests looked at him, and tried to catch his eye, he instead spoke with a young flower girl, and was also seen with a woman with a young baby, it said.