Justin Bieber makes stylish appearance at Billie Eilish's brother's wedding

Justin Bieber suits up for Billie Eilish’s brother Finneas Baird O'Connell’s wedding

The Baby hitmaker traded his usual laid-back style for a polished wedding-day look as he attended the star-studded celebration over the weekend alongside his wife Hailey Bieber.

Later he gave fans a glimpse of the occasion himself by sharing a series of selfies from the nuptials.

The Baby hitmaker captioned his Sunday, August 30, social media post with red heart emojis.

The selfies show him clad in a classic black suit, crisp white shirt and dark sunglasses, while Hailey brought a pop of colour to the occasion in a striking citrus-green halter dress.

The couple appeared relaxed as they posed for candid photos during the festivities.

In addition to Biebers, the high-profile guests at Finneas O’Connell and Claudia Sulewski’s wedding, which took place in Montecito, California, on August 29. included Kristen Bell, Dax Shepard, Emma Chamberlain, Rachel Sennott, Jason Sudeikis and Nina Dobrev.

For Finneas and Claudia, the celebration marked the culmination of a relationship that began in 2018. The couple announced their engagement in September 2025 before finally saying “I do” surrounded by family and famous friends.