Mary-Kate, Ashley Olsen

Courtesy of StyleMint

Suri Cruise isn't the only star trying out costumes before Halloween this year.

Mary-Kate and Ashley Olsen are getting into the dress-up spirit early, too, in this promotional video for their StyleMint site.

The tiny twins sport Batman, Catwoman and Star Wars get-ups, plus display that they have a sense of humor, too...

RELATED: Suri Cruise rocks ladybug costume

Mary-Kate Olsen, Ashley Olsen, Storm Trooper, Darth Vader

Courtesy of StyleMint

While in their Imperial stormtrooper and Darth Vader outfits, the pair have light sabers coming out of their ubiquitous coffee cups.

What's it all about?

By clicking through the various costumes and answering questions, readers eventually get a 15 percent discount to use on their site, which features designer T-shirts handpicked by the sisters.

That's great, but what we really want to know is what M-K and A are actually dressing up as come October 31!

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