The Untold Lives: Meet Justin Bieber's Four Younger Siblings (Updated 2025)
Justin Bieber, the global pop sensation, is one of the most recognizable faces in the world, but his family life is far more complex and sprawling than many fans realize. As of December 2025, the superstar is not an only child; he is the oldest of five, with four much younger half- and step-siblings from his father’s side of the family. The dynamic between the world-famous singer and his younger “crew”—Jazmyn, Jaxon, Bay, and Allie—is a constant source of fascination, often providing rare glimpses into the superstar’s private, brotherly side.
This deep dive provides the most current, up-to-date information on the entire Bieber sibling crew, detailing their individual lives, their current ages, and the surprising ways they are connected to the music icon. From a budding social media star to a recent Coachella attendee, these younger members of the Bieber clan are starting to make their own headlines.
Justin Bieber Siblings: Full Biography & Profile
Justin Bieber’s four younger siblings all stem from his father, Jeremy Bieber, who had children with two different partners after his separation from Justin's mother, Pattie Mallette. This has created a unique, blended family structure that Justin is known to prioritize and support financially and emotionally. Here is a complete profile of each younger sibling, with ages current as of December 2025.
- Full Name: Jazmyn "Jazzy" Bieber
- Relationship to Justin: Half-Sister (Paternal)
- Date of Birth: May 30, 2008
- Current Age (Dec 2025): 17
- Mother: Erin Wagner
- Noteworthy: A popular figure on social media platforms, often sharing her life and fashion. She was the first of the younger siblings to be born after Justin achieved fame.
- Full Name: Jaxon Bieber
- Relationship to Justin: Half-Brother (Paternal)
- Date of Birth: November 20, 2009
- Current Age (Dec 2025): 16
- Mother: Erin Wagner
- Noteworthy: Has a strong public relationship with Justin, often appearing at major events. He recently made headlines for attending Coachella with his famous older brother in April 2025.
- Full Name: Allie Bieber (née Rebelo)
- Relationship to Justin: Step-Sister
- Date of Birth: April 7, 2007
- Current Age (Dec 2025): 18
- Mother: Chelsey Rebelo Bieber
- Noteworthy: Allie is the daughter of Jeremy’s current wife, Chelsey Rebelo, from a previous relationship. She is technically Justin’s oldest younger sibling and is active on TikTok and Instagram, often posting about fashion and lifestyle.
- Full Name: Bay Bieber
- Relationship to Justin: Half-Sister (Paternal)
- Date of Birth: August 16, 2018
- Current Age (Dec 2025): 7
- Mother: Chelsey Rebelo Bieber
- Noteworthy: Bay is the youngest of the entire Bieber family and the only child of Jeremy and Chelsey Bieber together. She is often featured in family photos shared by her parents and step-sister Allie.
The Blended Family Dynamic: Half-Siblings vs. Step-Siblings
The distinction between the half-siblings and the step-sibling is key to understanding the full Bieber family tree. Justin’s biological parents, Jeremy Bieber and Pattie Mallette, separated shortly after he was born in 1994. Pattie Mallette chose not to have any more children, focusing entirely on raising Justin.
His father, Jeremy Bieber, however, went on to have a long-term relationship with Erin Wagner, which resulted in the birth of Jazmyn and Jaxon. They are Justin’s true half-siblings. After separating from Wagner, Jeremy married Chelsey Rebelo, bringing two more girls into the fold.
Bay Bieber is the biological daughter of Jeremy and Chelsey, making her a half-sister to Justin, Jazmyn, and Jaxon. Allie Bieber, on the other hand, is Chelsey’s daughter from a previous relationship, making her Justin’s step-sister. Despite the different parental connections, all four children are collectively referred to as Justin’s siblings and are known to spend significant time together.
The children of Jeremy Bieber and Erin Wagner—Jazmyn and Jaxon—are now teenagers navigating high school and the start of their own public lives. Jazmyn, who turned 17 in 2025, and Jaxon, who is now 16, have grown up with a pop star as an older brother, a unique experience that has given them a level of fame by association. Jaxon, in particular, has been seen attending major events like the world-famous Coachella Music Festival with Justin, showcasing their close bond.
The Role of Justin and Hailey Bieber in Their Lives
Justin and his wife, Hailey Bieber, have consistently shown a commitment to their younger family members. The relationship is often portrayed as warm and supportive, with the superstar frequently taking on a protective big-brother role. The siblings are often seen spending holidays and vacations with Justin and Hailey, whether in Canada or their Los Angeles home.
A Supportive Big Brother
Justin has always been vocal about his love for his younger siblings, often referring to them as his "crew." He has used his social media platform to celebrate their birthdays and milestones, solidifying his role as a supportive figure in their lives. This relationship is particularly important given the significant age gap; Justin was already a global star when Jazmyn and Jaxon were born, and he was 24 when the youngest, Bay, was born in 2018.
Hailey Bieber's Influence
Hailey Bieber has also integrated seamlessly into the blended family. She is frequently photographed with the children and appears to have a close, natural relationship with them, particularly with the older girls, Allie and Jazmyn. Her presence helps to further unify the complicated family structure, ensuring a cohesive unit for the younger siblings.
The recent news of Justin and Hailey welcoming their first child, Jack, has added another layer to the family dynamic, making the younger siblings aunts and uncles. This milestone event, which Pattie Mallette celebrated as becoming a grandmother, further connects the two sides of the Bieber family and ensures the children will grow up in a large, supportive environment.
What the Future Holds for the Younger Biebers
As the siblings mature, their own career paths are beginning to emerge. Jazmyn and Allie, now 17 and 18 respectively, are actively building their own personal brands on social media. They share glimpses of their teenage lives, fashion choices, and travels, amassing followers who are naturally curious about their connection to the famous singer.
Jaxon Bieber, at 16, is also showing an interest in the public eye, with his recent appearance at Coachella alongside Justin suggesting he is becoming more comfortable with the spotlight. While none of the children have officially launched a music or acting career, their exposure to the entertainment industry through their father and older brother provides a unique springboard should they choose to pursue a similar path.
Ultimately, the story of Justin Bieber's siblings is one of a modern, blended family navigating fame. Despite the complexities of having two separate family units stemming from their father, Jeremy Bieber, the children—Jazmyn, Jaxon, Allie, and Bay—remain a central, grounding force in Justin’s life, demonstrating a powerful and enduring family bond that transcends celebrity.
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