June 13, 2015 12:30 PM

Mary-Kate and Ashley Olsen turn 29 today!

While they haven’t said how they’ll celebrate this year, they could always take a note or two from themselves. The twins, who recently turned down appearing in the Netflix Full House reboot, Fuller House, are focused on fashion now, but before they turned to design, they were stars of their own You’re Invited series.

Playing themselves, the Olsens sang, danced, partied and showed fans how to throw any kind of soirée: a fashion party, a camping party, a costume party, a ballet party, a mall party and more.

But no video tops their 1997 You’re Invited to Mary-Kate & Ashley’s Birthday Party where they sing at a pool party: “A pool party is a cool party, It’s a gas, it’s a blast, it’s a splash, splash, splash. So get your suit and hat and sunblock too. We’re gonna splash all afternoon” in one of the most catchy songs you’ll ever hear. Give it a listen – and good luck getting the song out of your head.

Happy birthday girls – hope your birthday is a cool one!

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