Liv Tyler’s upbringing was shaped by one of Hollywood’s most unusual family revelations, involving music icons, shifting identities, and a truth that took years to fully emerge. Born to model and singer Bebe Buell, Liv was raised believing that her father was musician Todd Rundgren, who had been in a relationship with Buell around the time of her birth. Todd Rundgren even signed her birth certificate and stepped into the role of father, providing stability during her early years. For much of her childhood, Liv used the name Liv Rundgren and saw him as her dad in every meaningful sense, while also growing up within a wider circle of musicians and artists tied to her mother’s world.

Behind the scenes, however, there was another truth waiting to surface: her biological father was Steven Tyler. Bebe Buell reportedly kept Steven’s identity hidden due to concerns about his struggles with addiction at the time of Liv’s birth. The truth began to reveal itself when Liv attended an Aerosmith concert as a child and noticed Steven’s daughter, Mia Tyler, who looked strikingly similar to her. The resemblance, along with her mother’s emotional reaction, led Liv to piece together what was happening. When the truth was confirmed, she was overwhelmed, later describing the experience as shocking but ultimately grounding. Over time, she built a relationship with Steven and her half-siblings, while also maintaining love and gratitude for Todd, who had raised her. The experience left her with, as she reflected, not one father lost—but two fathers and two different kinds of love.