Prince William, now 41, a father of three and a busy future king, recently took time to party for his birthday, Us Weekly magazine reported. On Prince William's big day, the Prince of Wales and a few friends went out to a nightclub. (Incidentally, the photo above is not from the night in question, but William has movement.)

"William's friends came up with the idea of taking him out to a nightclub for his birthday. William was skeptical at first, but decided to step out of his comfort zone and do something he hadn't done in years. He ended up having a great time."

On his birthday, June 21, William "felt a little uncomfortable at first" but eventually "loosened up and cut a rug with his male friends."

William also celebrated more modestly with his wife, Princess Kate, and their children, Princes George, Charlotte, and Louis. Kate and William even had a special dinner with their children on his birthday," the source says, "OK, the night out with the guys happened two days later, on Friday, June 23, when the crew visited KOKO in London, where he "met his longtime friends Guy Perry, who is also the godfather of his children, and danced and drank beer with James Mead," the report said.

It may have been a while ago, but William (and Kate) were regulars in London nightclubs in the 2000s.