« Lupita Nyong'o Has a Beef with Miley Cyrus | Main | Watch Kids Re-enact Oscar-Nominated Movies »

Mary-Kate or Ashley? Their Sister Reveals Her Favorite

Charles Sykes/Bravo(LOS ANGELES) -- If you are an Olsen fan, it's the question you've always wanted answered: Which Olsen twin, Mary-Kate or Ashley?

When little sister Elizabeth Olsen, 25, was put on the spot on Watch What Happens Live, she made her choice of favorite twin -- who are both 27 -- and it all came down to the birthday call.

"Ashley remembered my birthday," Elizabeth said. "But I don't hold grudges against Mary-Kate forgetting mine. She was out of town! I should have just said my brother!"

Elizabeth turned 25 this past Sunday.

Live host Andy Cohen softened the blow for Mary-Kate by saying, "Ashley's in the lead today but tomorrow MK could do something amazing!"

Elizabeth added that she's close with all her siblings, including her brother.

"Mary-Kate's literally going to come home from her vacation and shoot me that I said that," she said. "She's in Jamaica."

She backtracked and said when on vacation, you rarely read the date, excusing her sister for not calling or texting.

Copyright 2014 ABC News Radio

ABC News Radio