Tessa Thompson In Rosie Assoulin at the 2017 Emmys

Tessa Thompson attends the 69th Annual Primetime Emmy Awards - Getty -P  2017
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She's a rainbow warrior, indeed.

Tessa Thompson, of the Emmy-nominated HBO series Westworld, arrived on the Emmys red carpet on Sunday night wearing a rainbow-colored Rosie Assoulin dress.

Featuring a high collar and cutouts at the waist, the multicolored, pleated lurex gown is from the designer's Resort 2018 collection.

Assoulin is a rising American fashion designer, known for her arty, sport-elegant style, whose designs have been worn by Olivia Wilde, Ruth Negga and Elizabeth Olsen. 

Westworld is tied with Saturday Night Live for the most Emmy nominations.

Later this fall, Thompson is set to star in Marvel's Thor: Ragnarok.