but their precious throwback photos prove the lasting depth of their bond. From birthday posts to cheeky flashbacks, see some of Billie Eilish's cutest snaps — before she soared to stardom.

Fans quickly were obsessed with the photos, leaving comments along the ... What a time to be alive!" MORE: Billie Eilish makes surprising revelation about her romantic life: 'Some of y'all about ...

Billie Eilish wears Gucci Flashtrek sneakers in London on Feb. 19. Billie Eilish on the red carpet at the 2020 Brit Awards, held at the O2 Arena in London on Feb. 18, 2020. Billie Eilish in Gucci at ...

Here, are the best photos of celebs out and about this week. Come back tomorrow for more of the latest A-list outings! PG/Bauer-Griffin/GC Images Billie Eilish looks "Happier Than Ever" while out ...

Billie Eilish and Charli XCX dance on a pile of underwear in the music video for their newly released remix, 'Guess.' Billie Eilish pranks calls her A-List friends including Margot Robbie ...

A tearful Justin Bieber said that she wanted to “protect” Billie Eilish on a resurfaced interview after Diddy’s ...

Billie Eilish has pretty much grown up in the public ... Entertainment Tonight shared photos of them kissing in Los Angeles after having dinner at Crossroads Kitchen. A source told the publication ...

Billie Eilish delivered a powerful In Memoriam tribute at the 92nd annual Academy Awards. Billie Eilish displayed an interesting on-camera reaction during the 92nd Academy Awards. The celebrated ...

Billie Eilish claps back at trolls who say she should "dress normal" to be "hotter" ...

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