The 100th birthday is always a special one. And the two-time defending Stanley Cup champions made sure it was one for the National Hockey League.
The Penguins shared a video on Sunday featuring team mascot, Iceburgh, throwing a surprise party for the NHL complete with party guests and a custom-made hockey rink cake.
And that was just one of the wishes tweeted out by teams Sunday as the NHL celebrated its 100th birthday.
The NHL kicked things off by tweeting out the first-ever schedule.
Then the league's teams followed suit.
The Buffalo Sabres had a little party complete with favors.
The Minnesota Wild tweeted out a special gif.
Some birthday greetings from the Winnipeg Jets were shared.
The Calgary Flames shared some special pictures.
The Detroit Red Wings sent their best.
The Philadelphia Flyers took us on a quick trip down memory lane.
The New York Rangers wished the league another 100 great years.
And the Vancouver Canucks put together a special birthday card.
Plenty of others wished the league well, far too many to list here, so on behalf of the NHL we will give out the big "thank you" to everyone who sent their birthday wishes.