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For some stars, acquiring an Oscar dress is no easy task.

Olivia Munn, who is presenting an award at Sunday's ceremony, opened up to E! News' Sibley Scoles about how she will go about picking the perfect look for the big day...and she may end up doing so at the last moment.

"I've been told that no matter what we like, even if we love it, we have to stay open to dresses getting released like the day before because there might be designers who have an exclusive with a certain actress," she said. "And then they're trying on everything and then they decide they don't want this dress or that dress, which by the way, like...if it doesn't work on this person...it's still super high end couture."

"So you have to just be open to anything that happens, which means you have to have a really great glam team around you, so that they can like change and do whatever they need to do to fit the dress in the moment," she added.

The 35-year-old The Newsroom alum and X-Men: Apocalypse star made her comments Tuesday at the Vanity Fair and Fiat Young Hollywood Celebration at Chateau Marmont in West Hollywood. She attended the event with boyfriend and NFL star Aaron Rodgers. The two have been together since at least spring 2014.

Vanity Fair Young Hollywood, Aaron Rodgers, Olivia Munn

Charley Gallay/Getty Images for Vanity Fair

This will mark Munn's first onstage appearance at an Oscars ceremony and second time attending. At the 2013 Oscars, the actress walked the red carpet in a red, strapless, satin Marchesa Fall 2013 gown with a gold embellished bodice. She later changed into a pale pink, strappy, embellished Versace Atelier Couture Fall 2012 gown for the Vanity Fair Oscars after-party.

Olivia Munn, Oscars 2013

Jason Merritt/Getty Images

Munn has attended Vanity Fair's annual Oscars after-party four times. Last year, she sported a teal Zac Posen Fall 2015 halter gown and attended the event with Rodgers.

Jason Segel, Olivia Munn

Jason LaVeris/FilmMagic

Earlier this month, Munn, who honed her hosting chops on Attack of the Show several years ago, and Jason Segel co-hosted the Academy of Motion Picture Arts and Sciences' Scientific and Technical Awards. The show honors people and companies who have contributed to motion pictures with their discoveries and innovations. Munn wore a black, printed Altuzarra maxi dress.

Check out all of our Oscars 2016 coverage.