It's June 13 and most millennial women know what that means: It's the Olsen twins' birthday.

Any true fan of the super-famous and super-private sisters doesn't need the fun club kit to remind them of the fact that Mary-Kate andAshley Olsen turn 33 today, ringing in another year of rare public appearances and impossibly chic street style that has Instagram salivating (even though the Olsens would never dare go on social media).

At the height of their fame in their teens, it seemed like we knew every little thing about Mary-Kate and Ashley, but as they disappeared from the spotlight and focused on building their fashion empire, they became petite enigmas, endlessly fascinating and impossibly unknowable.

Despite their best efforts to remain mysterious, we've collected some facts about the world's most famous twins, including which of their Full House co-stars tried to have them fired from the hit ABC show and how a Greek shipping heir ignited a public feud with Paris Hilton.

So test your Olsen knowledge and see if you knew these 33 things about Mary-Kate and Ashley...we'll try to blow your mind by dinnertime with these tidbits...

90s TV Catchphrases, Ashley Olsen, Mary-Kate Olsen, Full House

ABC/BOB D'AMICO

Mary-Kate Olsen, Ashley Olsen, How the West Was Fun

Warner Bros.

Mary-Kate Olsen, Ashley Olsen, Passport to Paris

Dualstar Productions

Mary-Kate Olsen, Ashley Olsen, New York Minute

Warner Bros.

Paris Hilton, Stavros Niarchos

John Shearer/WireImage for Teen Vogue

Olivier Sarkozy, Mary-Kate Olsen

Andrew H. Walker/WWD/REX/Shutterstock

Mary-Kate Olsen, coffee

Elder Ordonez/INFphoto.com

Mary-Kate Olsen, Ashley Olsen, Holiday in the Sun

Dualstar Productions

Mary-Kate Olsen, Ashley Olsen

@Sephora, Instagram

Ashley Olsen, 2019 Vanity Fair Oscar Party

NINA PROMMER/EPA-EFE/REX/Shutterstock

Fuller House, Mary-Kate Olsen, Ashley Olsen

Netflix; Getty Images

Ashley Olsen, Mary-Kate Olsen, 2019 CFDA Awards, Red Carpet Fashion

Matt Baron/Shutterstock

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