The summer may be coming to a close, but Brat Summer is a lifestyle that never ends—especially now that Brat superstar Charli XCX is starring in Skims’ latest campaign for cotton essentials.

You don’t have to “Guess” the color of Charli’s undies. In this sultry campaign, she’s pictured wearing selects from Skims’ Cotton Rib and Cotton Fleece collections, including the Cotton Rib Split Bralette, Cotton Rib Boxer, Cotton Fleece Shrunken Waffle Lined Zip Up Hoodie, and Cotton Rib Bikini.

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“SKIMS empowers people to feel confident in their own skin, which is the essence of Brat, ” Charli XCX is quoted in a press release. “I am excited to be working with a brand that understands that comfort and style don’t need to be compromised. Shooting with Petra for this campaign was a dream and I was so excited to get on set and wear these timeless, sexy pieces. Also, the puppies were beyond cute.”

“Having Charli XCX as the face of our new SKIMS campaign is so exciting. She is a one-of-a-kind talent who has truly cemented herself as a megastar within music and beyond,” SKIMS co-founder and Chief Creative Officer Kim Kardashian is quoted. “This is such an exciting time for the brand, and we are honored Charli and Petra chose to collaborate with us as SKIMS is always trying to highlight individuals at the forefront of culture.”

The looks Charli is wearing and more will be available at skims.com on Wednesday, Aug. 21, at 12 p.m. ET. See more images of the campaign below, and learn more at skims.com.