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Happy Twins Day to Mary-Kate and Ashley Olsen, Tia and Tamera Mowry and More Famous Duos

Mary Kate Olsen, Ashley Olsen, Tia Mowry, Tamera Mowry Larry Busacca/WireImage, Enrique RC/PacificCoastNews.com

When it comes to celebrity twins, of course you know all about Mary-Kate and Ashley Olsen.

The successful fashion designers, who first melted our hearts in Full House, starred in countless projects together. Who didn't want to travel with the girls in Passport to Paris or Holiday in the Sun?

But the always fashionable Olsen sisters aren't the only stars who share a twin sibling.

PHOTOS: See which celebs gave birth to adorable twins

Good Charlotte members Benji and Joel Madden share a bond that goes way beyond the stage. Barbara and Jenna Bush have plenty of memories together but in and out of the prestigious White House. Finally, Tia and Tamera Mowry had us all shouting Sister, Sister! Now, they are both all grown up with families and husbands and starring on the Style Network.

In honor of this weekend's Twins Days Festival, we're taking a closer look at Hollywood's most famous family pairings.

You might just be surprised to see who has a famous twin. Yes, we're talking about you, Ashton Kutcher!

PHOTOS: Check out our favorite celebrity twin siblings

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