"I went to this exhibition polo match one time," the Episodes actor, 47, began. "The princes were there and they were playing... I went to this thing. You get invited by the royals, you go."
While he gave few details on the event, LeBlanc did indeed attend a charity polo match at England's Coworth Park in May 2010.
"There was a big line to go and meet them afterward," the star continued. "So I went and I got in line and met the princes... both of them, William and Harry. All they want to know is, 'When is the Friends reunion?' That's all they wanted to know about."
LeBlanc has been asked the question many times over the years, but according to the actor, he offered no special allowances for Prince William and Prince Harry despite their royal titles.
"I told them to f--k off," LeBlanc spilled with a laugh. "They were really cool. Then actually, I was in a bar one time and Harry was there and I ended up sitting at the same table with him. He's a lot of fun."