Liv Tyler recalls meeting own sister at Aerosmith concert for first time but having no idea they were siblings

Liv Tyler has recalled meeting her own sister at an Aerosmith concert for the first time, having no idea that the pair were actually related.

On an episode of the iHeart radio podcast, Sibling Revelry With Kate Hudson and Oliver Hudson, the actress and her younger sister, Mia, spoke about the emotional moment they realised they were sisters.

The pair are half-siblings and share the same dad, Aerosmith frontman Steven Tyler, but they grew up living totally different lives.

Speaking about the pivotal moment, Mia explained: "I remember there were no kids backstage. So we played hard that night. And we were at this VIP area, outside of the green rooms, and we were just like, you know, doing our eight and nine-year-old thing, and this fan lady came up and she was like 'oh my god, you girls are so cute. Are you guys sisters?'"

Liv and Mia lived different lives growing up (Steve Eichner/WireImage)

Liv added: "That particular night that she's [Mia] talking about, Guns n' Roses were opening for Aerosmith. It was the beginning of their song 'Welcome to the Jungle.' We had driven to the gig at a place called Great Woods."

Becoming emotional, she added: "We got tickets and we went to the audience and we were standing, and Guns n' Roses was playing and I was so excited because I just like loved Guns n' Roses. And on the side of the stage was this one girl standing there."

Liv explained she had been watching the band, when she recalled seeing Mia, who 'looked exactly like [her]'.

After her mum burst into tears, the truth about her father came out.

Steven and Liv Tyler (Matt Winkelmeyer/Getty Images)

"Like we literally had the same outfit on. We had both had perms, like spiral perms, pink frosty lipstick. We were both wearing a Aerosmith concert t-shirt with black leggings and Reebok high top sneakers. I looked and I was like, 'wait, that's me'. It was really weird. I was literally like looking in the mirror seeing double," she added.

"I looked at my mom, and she just started crying. My mom was bawling, and I was like, 'is Steven my dad?' and she just burst. She took me to a bench and we sat on at an outdoor amphitheater, and she told me the whole story in the most sincere, beautiful way."

The pair became emotional talking about it (James Devaney/WireImage)

Liv and Mia grew up living separate lives with their mothers, Bebe Buell and Cyrinda Foxe.

Liv actually believed that she was rock star Todd Rundgren's daughter, as he had signed her birth certificate and was a father figure throughout her life.

"I'm so grateful to Todd for choosing to be a father figure to me," Liv told The Guardian in 2017.

"It's a big thing for a man to say, 'I know this kid might not be mine, but I still want to be her father.' Although he and my mom weren't together, he was always a very stable, loving force in my life."

She also praised both her fathers as being 'unconventional', adding: "Both my fathers are unconventional. They are like unicorns or wizards.

"They are musicians through and through. The way they think is just different. Their eccentricities have made me more practical and more normal, in a way. As a parent, my fantasy is to cook every meal, read every story, do everything, and also work all day. I’m overly hard on myself."