The 40‑year‑old singer and Polansky welcomed the baby girl after a gestational carrier gave birth in Los Angeles, as reported by TMZ, which verified rumours that had circulated in recent days.
Gaga, who has spoken publicly about living with fibromyalgia—a condition that causes chronic pain and fatigue—shared the news while continuing work on her upcoming film Abracadabra.
Photos of the newborn walking with her parents leaked early this week, providing the first public glimpse of Rose Bean with her mother and father.
Around the same time, actress Lena Dunham, a contemporary of Gaga, announced that she had given birth to a daughter in August through assisted reproduction, illustrating another celebrity example of alternative paths to parenthood.
The confirmations end weeks of speculation about Gaga’s family plans, confirming that she has expanded her family via surrogacy.