It is clear that Billie Eilish and Finneas are having fun together over the holidays.

On Monday night, the siblings were seen riding their bikes through Los Angeles’ streets together. The 19- and 23-year-old Bad Guy songwriters kept their eyes glued to the road as they navigated the suburban streets of Los Angeles.

Hitting the pavement: Billie Eilish and her brother and producer Finneas were spotted riding their bikes through the streets of Los Angeles on Monday

The singer of No Time To Die was spotted donning a black hoodie with a graphic design, matching sweatpants, and Nike Air Force Ones. Underneath her hood, she had a white beanie.

Her brother had on a pair of slim jeans with torn knees, white sneakers, brown sunglasses, and a black v-neck t-shirt. Wearing an ashy grey helmet, the producer made cautious to protect himself.

As a preventative measure against the current surge in COVID-19 cases in Los Angeles, both singers donned face masks; Finneas chose a camouflage design, while his sister coordinated hers with her predominantly black outfit.

The siblings have collaborated since they were little and in 2015, they put out their debut song on SoundCloud, titled She is Broken.

Keeping it consistent: The Ocean Eyes singer opted for an entirely black-and-white wardrobe for her outing

Starting early: The siblings have collaborated on musical projects from early on in their careers, beginning with the 2015 track She's Broken; they are seen in November

The two worked together once more the next year on the song Ocean Eyes, which eventually became Eilish’s breakthrough hit.

With Finneas handling all of the production, the pair released the EP Do not Smile At Me in 2017. The record peaked at number 14 on the Billboard 200 chart.

2019 saw the release of Eilish’s debut album When We All Fall Asleep, Where Do We Go?, which was produced by her brother once more after two years of production labor.

Honest opinion: In an interview with Vogue, Finneas stated that 'There¿s no other person I like working with as much as my sister'; the brother and sister are seen in 2019

Sharing the glory: The collaborators are seen at the 62nd Annual Grammy Awards in January, where Eilish's album When We All Fall Asleep, Where Do We Go? won multiple awards

High praise from critics and numerous accolades followed for the album, including the 2020 Grammy Award for Album of the Year and the Producer of the Year, Non-Classical award for Finneas.

The producer talked about working with his younger sibling in an interview with Vogue, noting that they can readily share their individual musical ideas with one another.

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We simply adore one another, communicate honestly with one another, and have a common creative language. My sister is the only person I enjoy working with as much,” he said.

The producer added that the two have had some time to relax in recent months before they must on the road once more.

In November and December, we eased down, so things have been relatively acceptable overall. We have a whole year of touring ahead of us, which is a lot, he said.