The Bieber Bunch: Meet Justin Bieber's Four Younger Siblings And What They're Doing Now (2025 Update)

Justin Bieber's sprawling family tree is far more complex than many fans realize, extending well beyond his wife, Hailey Bieber. As of December 2025, the global superstar is the eldest of a lively, blended family, acting as a supportive big brother to four younger siblings who are all navigating their own paths in and out of the spotlight. These relationships, primarily through his father, Jeremy Bieber, offer a rare and touching glimpse into Justin's life away from the music charts and stadium tours, revealing a deep-seated commitment to his family.

The dynamic between Justin and his half-siblings and step-sister is a testament to the modern family structure. They frequently appear on Jeremy Bieber’s social media, and Justin often shares personal moments with them, highlighting his role as a loving, protective older brother. From red carpet appearances to casual family vacations, the "Bieber Bunch" is growing up fast, with some already showing signs of following in their famous brother's footsteps.

The Complete Bieber Sibling Profile: Biography and Current Status (2025)

Justin Bieber has a total of four younger siblings: two half-sisters, one half-brother, and one step-sister. All four are from his father, Jeremy Bieber's, subsequent relationships after his split from Justin's mother, Pattie Mallette. This section details the complete profile of each sibling, including their current age and family lineage.

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• Full Name: Jazmyn Kathleen Bieber
• Relationship to Justin: Half-Sister
• Parents: Jeremy Bieber and Erin Wagner (Jeremy's ex-partner)
• Date of Birth: May 30, 2008
• Age (as of Dec 2025): 17 years old
• Current Status: High school student, active on social media (TikTok, Instagram), and often shares content related to fashion and lifestyle. She is the most public-facing of the younger siblings.

• Full Name: Jaxon Julian Bieber
• Relationship to Justin: Half-Brother
• Parents: Jeremy Bieber and Erin Wagner (Jeremy's ex-partner)
• Date of Birth: November 20, 2010 (Approx.)
• Age (as of Dec 2025): 15 years old
• Current Status: Teenager, known for his love of sports, particularly hockey. He recently gained attention for attending the Coachella Music Festival with Justin in April 2025.

• Full Name: Bay Bieber
• Relationship to Justin: Half-Sister
• Parents: Jeremy Bieber and Chelsey Rebelo (Jeremy's current wife)
• Date of Birth: August 16, 2018
• Age (as of Dec 2025): 7 years old
• Current Status: Youngest of the half-siblings, frequently featured on her parents' social media, enjoying a quiet childhood.

• Full Name: Allie Rebelo (formerly Allie Bieber)
• Relationship to Justin: Step-Sister
• Parents: Chelsey Rebelo (mother) and an unnamed father
• Date of Birth: 2008 (Approx.)
• Age (as of Dec 2025): 17 years old
• Current Status: A popular social media personality and model, she is very close to her step-father Jeremy and her step-brother Justin. She is a high school senior and often shares her life with her large online following.

Jazmyn and Jaxon: The First Generation of Half-Siblings

The arrival of Jazmyn Bieber in 2008 and Jaxon Bieber in 2010 marked a significant shift in Justin’s life, transforming him from an only child into a big brother at the age of 14. These two siblings share a mother, Erin Wagner, and father, Jeremy Bieber, and grew up in Canada, maintaining a strong bond with their superstar brother despite his global fame and constant travel.

Jazmyn Bieber, now 17, is quickly becoming a figure of interest in her own right. She has built a substantial presence across platforms like TikTok and Instagram, sharing fashion hauls, makeup tutorials, and glimpses of her teenage life. Her content, which is remarkably grounded despite her family connection, focuses on lifestyle and beauty, positioning her as a genuine influencer. She often posts throwback photos with Justin, affectionately calling him "my big brother," which resonates deeply with fans who appreciate their close relationship.

Jaxon Bieber, at 15, is embracing the world of sports and teenage fun. While his sisters lean towards social media and fashion, Jaxon is known for his love of hockey and a more laid-back, athletic style. One of the most recent and public updates on Jaxon came in April 2025 when he was seen attending the Coachella Valley Music and Arts Festival alongside Justin. This public outing highlighted their strong brotherly bond and gave fans a rare glimpse of Jaxon in the adult world of his famous sibling.

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Both Jazmyn and Jaxon have been seen supporting Justin at major events, including movie premieres and award shows, demonstrating that the geographical distance and age gap have not weakened the core family unit. Their presence provides a vital link to Justin's Canadian roots and the family life he cherishes.

Bay and Allie: The Newest Additions and Blended Family Dynamics

The family grew again following Jeremy Bieber's marriage to Chelsey Rebelo in 2018. This union introduced two more young women into Justin's life: his youngest half-sister, Bay Bieber, and his step-sister, Allie Rebelo. This blending of families showcases a beautifully modern and supportive environment for all the children involved.

Allie Rebelo, who is around 17, is technically Justin’s step-sister but is treated by the family as a full sibling. She is Chelsey’s daughter from a previous relationship and has fully integrated into the Bieber family structure. Allie is also a successful social media personality and a model, often sharing photos with her mother, Chelsey, and her step-father, Jeremy. Her close relationship with Justin is evident in their shared family photos, where she is always included in the 'Bieber Bunch' gatherings. Her modeling career is starting to take off, making her another sibling to watch in the coming years.

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Bay Bieber, the youngest of the half-siblings at 7 years old, is the daughter of Jeremy and Chelsey. Her birth in 2018 was a joyful occasion that Justin celebrated publicly, often posting photos with the adorable toddler. Bay, whose name means 'small bay' or 'small harbor,' is the center of attention in the Jeremy and Chelsey household. While she is too young for a public profile, her loving interactions with her older siblings, including Justin, are frequently documented on her parents' Instagram accounts, showing a sweet, protective side of the entire family.

The Protective Big Brother: Justin's Role in His Siblings' Lives

Despite the demands of being one of the world's biggest pop stars, Justin Bieber consistently makes time for his younger siblings. His relationship with them is marked by genuine affection and a protective instinct, which is particularly visible whenever they are in the public eye. He has often spoken about the joy they bring to his life and how they keep him grounded amidst the chaos of fame.

The age gaps—ranging from approximately 17 years with Jazmyn and Allie to a 24-year difference with Bay—create a dynamic where Justin is less of a peer and more of a mentor and guardian. He often takes on the role of the cool, supportive older brother, providing guidance and a fun presence in their lives. This is a crucial element of his personal life, allowing him to step away from his professional persona and simply be 'Justin' to his family. The support extends to his wife, Hailey Bieber, who is also known to be close with her younger in-laws, often commenting on their social media posts and joining family events.

The siblings of Justin Bieber are more than just footnotes in a celebrity's biography; they are a core part of his personal story. As Jazmyn, Jaxon, and Allie move into their late teens and early adulthood, and Bay continues to grow, their individual journeys are becoming increasingly fascinating. The way the entire extended Bieber family—including Jeremy, Chelsey, Pattie Mallette, and Hailey—manages their blended, high-profile life offers a compelling narrative of love, support, and modern family resilience in the 2025 celebrity landscape.