Billie Eilish was spotted with a big smile on her face as she left a productive gym session earlier on Monday.

The Ocean Eyes singer, 20, donned a stylish workout ensemble which included a pair of thick boots which she carried in the crook of her arm.

The talented performer recently celebrated her one-year anniversary of her album, Happier Than Ever, and also gave a grand performance at the Hollywood Bowl on Friday.

Gym session: Billie Eilish, 20, was spotted after working up a sweat as she stepped outside following her workout in Los Angeles on Monday

The award-winning singer donned a vintage, printed black T-shirt which was sleeveless to help her stay cool during her sweaty workout.

She paired the top with a pair of brown gym shorts. The music artist slipped into comfortable blue sneakers which she wore with black ankle socks.

Her dark hair was pulled back into a loose ponytail to keep most of her out of her face, with a few loose strands falling out.

Workout chic: The award-winning singer donned a vintage, printed black T-shirt which was sleeveless to help her stay cool during her sweaty workout

The songwriter had a backpack slung over her shoulders as she carried a pair of thick black boots in her arm.

She also held a large bottle of water in her other hand so help her stay hydrated throughout her outing.

During an interview on the Little Gold Men by Vanity Fair podcast earlier in February, Billie touched on the topic of fashion.

‘Since I can remember, fashion has been how I convey my feelings, how I feel about myself, and my mood. It’s really like a security blanket, and I can’t remember when it wasn’t,’ she explained.

Billie Eilish performs surprise concert at Amoeba Records in LA

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Talented duo: Both Billie and her brother, Finneas, work together to create chart-topping hits; pictured at the 2022 MET Gala

Devoted following: The performer often shares selfies and photos with her 104 million fans and followers on Instagram

Billie and her brother, Finneas, who helps in the creation and production of her music, gave a surprise anniversary performance to celebrate her 2021 album, Happier Than Ever, at Amoeba Records in Hollywood on Saturday.

In an interview with Zane Lowe on his podcast, the performer talked about the process of working with her brother and songwriting.

‘For me, I kind of go through phases of feeling really creative and actually getting stuff done, and then going through phases of absolutely nothing at all, like musically,’ she stated.

‘But Finneas, the guy can write so fast and so well and so often and constant. I mean, it’s his way of expressing himself,’ Billie stated of her talented brother.

Stylish: The talented singer-songwriter often stuns in her fashionable outfits when she performs and attends events

Successful career: Billie gained recognition back in 2015 with her debut single, Ocean Eyes; the singer pictured performing at Madison Square Garden in February of this year

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