Actor Liv Tyler thought Todd Rundgren was her biological father for 11 years. Then, she discovered Aerosmith singer Steven Tyler is her real dad at a concert.

Liv confirmed Steven, now 77, was her father at age "11 or 12" when she got a paternity test done. Years before, however, she attended one of his concerts and her mother, now 71, spilled the news.

Liv Tyler assumed Todd Rundgren was her father, considering he was the man who signed her birth certificate when she was born in 1977. More importantly, it's the role the musician played for the ...

One person said, “She looks like Todd Rundgren more than Steven Tyler.” Another person who had the same sentiment joked, “Better retake that dna lol.” ...

The 47-year-old, who had believed until that moment that her birth father was musician Todd Rundgren, also explained how she felt after the show. “The first wave was shock,” she continued.

Liv detailed how hard it was for Todd Rundgren, who helped raise her, to learn the news, and what it was like meeting her half-sister, model Mia Tyler, for the first time.

Liv Tyler, whose biological dad is Steven Tyler, explained where she stands with her adoptive dad Todd Rundgren since learning the Aerosmith frontman was her father.

Actor Liv Tyler thought Todd Rundgren was her biological father for 11 years. Then, she discovered Aerosmith singer Steven Tyler is her real dad at a concert.© Getty Images ...