Claudia Sulewski opens up about her bond with sister-in-law Billie Eilish
“Claudia Sulewski has shared insight into her relationship with Billie Eilish, revealing that the two regularly discuss their shared interests in beauty and business. Speaking exclusively to People at t…”
Speaking exclusively to People at the 2026 WWD Honors, Sulewski praised her sister-in-law’s taste and revealed that they frequently exchange thoughts about their respective beauty brands. “We both love each other’s brands so much,” Sulewski said, describing how the pair talk about industry trends and products.
She added that beauty is something they discuss “all the time”. Sulewski is married to Grammy-winning musician Finneas O’Connell, Eilish’s older brother. The couple tied the knot on August 29, 2026, in Montecito, California, after getting engaged in September 2025.
Beyond their family connection, Sulewski and Eilish have also developed a shared interest in the beauty industry. Sulewski founded Cyklar, her bodycare and fragrance company, in 2023, while Eilish launched her own fragrance line in 2021.
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Cyklar initially introduced a unisex body cream before expanding its range to include body washes and fragrances. Sulewski also revealed that the company is planning to introduce bodycare products targeting specific skin concerns and expand its fragrance collection over the coming year.
The entrepreneur described Cyklar's philosophy as being centred on sensory self-care and the idea that taking care of oneself can help people better support those around them. Sulewski also revealed that she and Finneas created a custom Cyklar fragrance together for their wedding.
She wore four custom Oscar de la Renta looks during the wedding celebrations, describing the designs as timeless, elegant and glamorous. Her comments offer a glimpse into the relationship between the two women, who share both family ties and an interest in building their respective beauty businesses.
While Eilish has established her fragrance brand alongside her music career, Sulewski continues to develop Cyklar as an expanding bodycare and fragrance company.
Written by Sheheryar Munawar
Aman-e-Pakistan Senior Journalist & Bureau Reporter
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