Billie Eilish, Finneas, and Claudia Sulewski pictured at the 2019 American Music Awards.

Billie Eilish's Relationship With Finneas' GF Claudia Sulewski Is Really Special

The two stars are closer than you may think.

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Billie Eilish and her brother Finneas are the best sibling duo. The pair has cooked up several hit songs together, like “Bad Guy” and “Happier Than Ever.” They routinely perform alongside each other at countless award shows and concerts. Since they’re with each other almost every day, you might be wondering if Eilish is friends with Finneas’ girlfriend Claudia Sulewski.

Finneas and Sulewski reportedly began dating in 2018. Over the years, it seems Sulewski has grown close with her boyfriend’s family, including Eilish. Sulewski doesn’t hold back in showing love for her Eilish on Instagram.

For example, Eilish and Suleweski were cheezin' big time in this family photo from May 2019, which Finneas shared on Instagram for Mother’s Day. The pic marked the first time Eilish and Sulewski appeared on social media together.

That June, Finneas also shared a photo chilling with a bunch of his friends, including Eilish and Sulewski front and center. "A delightful group of people to associate yourself with," the musician captioned the pic.

It became pretty apparent Eilish and Sulewski were hanging on the reg when Finneas shared this photo of the trio having out on a trampoline that September. "These are a few of my favorite things," he captioned the pic. Sulewski truly solidified their friendship by also sharing an adorable photo hugging Eilish during the trampoline photoshoot. Sulewski even alluded to the fact she might have a nickname for Eilish. "Squinchy," she captioned the sweet pic.

Weeks later, Eilish and Sulewski once again hung out with Finneas and a large friend group to celebrate Halloween. Everyone in the photo that Finneas shared on Instagram looked like they were having a spooktacular time.

At the 2019 American Music Awards, Eilish, Finneas, and Sulewski were seen leaning in towards each other while having a conversation.

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One of the sweetest moments that happened between Eilish and Sulewski came after the 2020 Grammy Awards when Sulewski shared a tribute to Eilish. She congratulate her on becoming the first female to dominate all four major Grammy award categories. "Ignore the watermarks, your eyes should only be looking at this history making queen," Sulewski captioned the pics, which have since been deleted.

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Eilish and Sulewski then rang in 2021 by going to a Justin Bieber concert together. Eilish is a longtime fan of Bieber’s. “Our first justin bieber concert💘 HAPPY NEW YEAR!!!!” Sulewski captioned an Instagram post her and Eilish at the show.

Sulewski also gave Eilish an IG shoutout to celebrate her 20th birthday in December of last year. “ILOVEYOUSOMUCH !!! happy birthday billie the world wouldn’t be the same without you,” Sulewski captioned the post, which featured a photo collage of her and Eilish chilling in a pool.

After taking a deep dive on their social media accounts, it's pretty evident that Eilish and Sulewski hang out alllll the time. In fact, it looks like Sulewski has practically become part of Eilish and Finneas’ family. You could say they’re all...“Happier Than Ever.”

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