The Bourne Legacy star also revealed that they've named their daughter Ava Berlin Renner.
Jeremy welcomed his baby into the world on Thursday, according to reports, and on Friday he revealed the mother's name along with the news.
First-time father: Jeremy Renner has confirmed
he's a dad for the first time after his girlfriend, Sonni Pacheco, gave
birth to their daughter on Thursday
'They are beyond thrilled,' Jeremy's spokesperson told PEOPLE in a statement. 'Mother and daughter are doing great.'
Us Weekly was the first to break the news, saying they had received confirmation from two separate sources.The former couple have been living together in Jeremy's Los Angeles home after he apparently agreed to put her up until their child was born.
'They used to date but it wasn't serious,' an insider told the magazine.
Baby mama: Jeremy and Sonni, who was pictured
looking heavily pregnant on January 25 in Los Angeles, have named their
daughter Ava Berlin Renner
Friendly: Jeremy and Sonni dated casually last year; when she fell pregnant he put her up in his home until the baby's delivery
The 42-year-old actor was previously overheard telling Eva Longoria he would be a father for the first time when the pair were spotted chatting earlier this year at the Golden Globe Awards in Los Angeles.
'Jeremy is delighted he is becoming a dad,' the insider said.
'He realises it's unconventional to have his baby mama, an ex-girlfriend, living with him and his roommate, but he just doesn't care.'
Action star: Jeremy is famous for his adventurous roles in films such The Avengers, here with Scarlett Johansson