She is filming an R-rated romantic comedy in Australia.

And Sydney Sweeney suffered an unfortunate wardrobe malfunction while shooting a beach scene with her female co-stars in Sydney on Monday.

The Euphoria star, 25, was seen playfully bounding through the water in sheer white lingerie when she accidentally popped out of her top.

Sydney didn’t appear to notice the nip slip, however, and continued splashing about with her ʙικιɴι-clad castmates.

At one stage, the Washington-born actress enthusiastically embraced her co-star Hadley Robinson, 28, who sported a skimpy printed ʙικιɴι.

Sydney showcased her famous cleavage and tiny waist during the scene, leaving little to the imagination in a white bra with pink lace detailing and a bow at the centre, and matching high-cut bottoms.

She swept her hair into a messy updo and completed her look with gold earrings and a matching necklace.

Also filming at the beach was Sydney’s co-star Alexandra Shipp, who looked fabulous in an orange ʙικιɴι top and black G-string bottoms.

The actress and singer, 31, displayed striking tattoos on her upper thigh.