Billie Eilish is keeping up the tradition of wearing unusual clothing (Picture: CPR / Backgrid)

Billie Eilish wore a seriously eye-grabbing shirt as she ran errands in Los Angeles.

The musician, 21, is known for her unique style, having worn her trademark black-and-green hair and baggy dark clothing for years.

(Not to mention recently attending a red carpet event dressed in Gucci pyjamas and huddled under a blanket alongside boyfriend Jesse Rutherford, 31.)

Now the Bad Guy chart-topper has been seen out and about in a t-shirt embossed with a picture of bare breasts, because why not.

The pop icon was spotted leaving the gym in Los Angeles in the get-up, more than likely causing a few second takes as she worked out in the R-rated tee.

She flashed a smile for cameras as she was papped wearing the outfit, which also included brown body-hugging shorts, a black backpack and dark baseball cap.

The singer’s gym gear was certainly a Look (Picture: CPR / Backgrid)

Billie had her hair up in a high ponytail to complete the casual look.

It comes after the star racked up millions of likes by posting an at-home lingerie photoshoot to Instagram.

In one of the snaps, Billie – dressed in all-black lingerie – pictured her legs daintily posed in front of a ceiling fan, as she showed off her shiny black heels and diamond-patterned tights

Another saw her look vacantly at the camera as her black hair spilled across a tartan bedspread.

The casual look omes after Billie stunned in an at-home photoshoot in lingerie (Picture: @billieeilish)

The star recently opened up about hating her body as a teenager and wearing baggy clothing to cover it (Picture: Instagram @billieeilish)

Keen to break her image as ‘the one who only wears baggy clothes’, Billie famously donned a pink corset on the cover of British Vogue in 2022, after struggling with her body image as a teenager.

In a new candid conversation with Vogue, Billie spoke about track My Future which reflects on her relationship with her self and her body.

‘Going through my teenage years of hating myself and all that stupid s**t,’ she said.

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‘A lot of it came from my anger towards my body, and how mad I was at how much pain it’s caused me, and what I’ve lost because of things that happened to it.

‘I felt like my body was gaslighting me for years. I had to go through a process of being like, my body is actually me. And it’s not out to get me.’

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This definitely caused some double-takes.