And being so public at such a young age forced the pint-sized stars to be disciplined in their work, which the former "Holiday In The Sun" and "Full House" stars admit wasn't that difficult for them."I think we're lucky [working hard] comes quite naturally for us," Mary-Kate says.

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(Photo by Kevin Mazur/Wire Image)NEW YORK, NY - FEBRUARY 15: Ashley Olsen (L) and Mary-Kate Olsen attend the J.

Mendel Fall 2012 fashion show during Mercedes-Benz Fashion Week at The Theatre at Lincoln Center on February 15, 2012 in New York City.

(Photo by James Devaney/GC Images)NEW YORK, NY - MAY 02: Ashley Olsen (L) and Mary-Kate Olsen attend the 'Manus x Machina: Fashion In An Age Of Technology' Costume Institute Gala at Metropolitan Museum of Art on May 2, 2016 in New York City.

(Photo by Larry Busacca/Getty Images)NEW YORK, NY - JUNE 01: Mary-Kate Olsen and Ashley Olsen pose on the winners walk at the 2015 CFDA Fashion Awards at Alice Tully Hall at Lincoln Center on June 1, 2015 in New York City.

(Photo by Charles Eshelman/Film Magic)LONDON, ENGLAND - FEBRUARY 22: (UK TABLOID NEWSPAPERS OUT) Mary-Kate Olsen and Ashley Olsen arrive at the Elle Style Awards 2010 held at The Grand Connaught Rooms on February 22, 2010 in London, England.

(Photo by Gareth Davies/Getty Images)UNITED STATES - NOVEMBER 17: It was easy to tell the Olsen twins apart at a Mo MA benefit: Mary-Kate went for demure, while Ashley rocked a leopard print!

(Photo by Robin Marchant/Getty Images)NEW YORK, NY - JUNE 02: Designers Ashley Olsen (L) and Mary-Kate Olsen attend the 2014 CFDA fashion awards at Alice Tully Hall, Lincoln Center on June 2, 2014 in New York City.

(Photo by Gilbert Carrasquillo/Film Magic)NEW YORK, NY - MAY 05: Mary-Kate Olsen and Ashley Olsen attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City.

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