Olivia Wilde paid tribute to Dolly Parton for Halloween, showing off the prosthetic boobs she wore beneath her costume to mimic the country star's big breast.

"BTS Dolly boobs," Wilde, 37, captioned a clip of herself bouncing around her room in the prosthetic, which she wore atop a burgundy sports bra.

Wilde also added, "Thank You for letting me borrow your rack," while tagging Sara Moonves, EIC at W Magazine, Parton's latest cover.

The preceding and following videos show the actress wearing a curly blonde wig and colorful makeup, heels and a yellow button-up shirt tied at the waist. She also placed a flower in her hair, completing the ensemble.

In one clip, she hops on a stationary bike in her costume, captioning the video, "In my mind this is how she works out."

Olivia Wilde wore prosthetic boobs while dressing as Dolly Parton for Halloween.
Olivia Wilde wore prosthetic boobs while dressing as Dolly Parton for Halloween.
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The "Don't Worry Darling" actress was later spotted at boyfriend Harry Styles' show in the look, as a fan recorded the star dancing beside the stage while he performed

Wilde has been snapped several times wearing the former One Direction singer's gear, wearing a black "Treat People With Kindness" sweatshirt ($54.99) from his merchandise line just last week during a coffee run to Starbucks