Melanie C recently opened up about how proud she is of her friend Billie Eilish! While promoting her new single "Blame It On Me" during an interview with Entertainment Tonight's Deidre Behar, the Spice Girls singer shared how she and Eilish's friendship first came about. 

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Melanie C talks about her experience seeing Eilish perform live

Melanie C told the outlet about when she saw Eilish perform last year. "It's very odd,” she said. “I am such a huge fan of her, her music, her brother and her family. They're the most wonderful people. And, I went along to see her show in London towards the end of last year -- she was playing quite a small theater in London."

"It was 2,000 people and she'd already outgrown it. She's such a huge star, but it was one of those moments when you think, ‘Wow, being in this audience is such a privilege,’ because you're never going to see her in this environment again."

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Melanie C attends The BRIT Awards 2020 on February 18, 2020.

Melanie C says Eilish's concert took her "back to being a Spice Girl"

Melanie C mentioned that something she found particularly striking about Eilish's concert was the fans' connection to her music. "The room was full predominately of teenage girls, screaming and singing every word, every ad lib, and I just felt this really mad connection because it took me back to being a Spice Girl," she said.

"It's quite weird because traditionally you have women or girls screaming for boys, whether it's boy bands or male artists -- when you think about Beatlemania or One Direction. So, it just really resonated with me."

Melanie C shared with Entertainment Tonight that she was able to meet Eilish and her family at the show. As it turned out, Eilish's dad was a big Spice Girls fan! And while she didn't know just how meaningful the advice she gave Eilish would be to her, she's glad that it "struck a chord."

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Melanie C talks Eilish's maturity: "She's so wise beyond her years"

Melanie C said that she's proud of how Eilish uses her platform to tackle issues such as body positivity, and openly speaks out against racial injustice. "She's so wise beyond her years," she said of Eilish.

“She knows she has a very powerful platform to be speaking from and she's using it in the best way. And, it's brave because everybody has an opinion and everybody is ready to criticize when you're in those positions. I feel extremely proud of her.”

"And, I feel for all younger artists now because the Spice Girls didn't have to deal with social media," Melanie C continued. "It was a very, very different time.  We felt pressure [and] we felt like we had a responsibility to our younger fans, but now you are literally under the spotlight. She handles it beautifully, so more power to her."

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Mel C opens up about eating disorder and depression: "Trying to be the perfect 'Spice Girl' made me ill"

Melanie C says she was "nervous" becoming Sporty Spice again

Melanie C revealed that her new music drew partial inspiration from a moment of insecurity she had when reuniting with the Spice Girls last year. "It had been a while since we had been onstage together, and I was nervous at the thought of becoming Sporty Spice again and thought I couldn’t do it,” she confessed. "Quite quickly I realized, I don’t become her -- I am her!"

"That made me start thinking about how I wanted to express moving forward and I thought [about] all of those wonderful experiences onstage and they’ve all gone into this album," she said. "So, the first single, "Who I Am," is about self-acceptance and accepting every part of yourself, your life and what you’ve been through and celebrating, not only your successes, but the tough things you’ve gone through."

Melanie C explains the message behind her song "Blame It On Me" 

Melanie C then went on to talk about her second single. "And, "Blame It on Me" has got a bit more swagger,” she said. "It’s about this toxic relationship [where] someone [has] completely blindsided you when they’re not who you thought they were."

"We all have these experiences in life and it’s nice to get it off your chest and bring out a song -- it’s dancy, got a bit of attitude and [is] very cathartic." 

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The video game inspired music video for the song also includes a nod to the music video for the Spice Girls' hit "Say You'll Be There," according to Melanie C. "I thought it was really fun to kind of revisit that especially after performing with the girls last year, and I’m feeling so spicy at the moment," she explained.