Billy Ray Cyrus is getting married again.
"They've been dating for a little while," a source told PEOPLE. "They grew close while working on music together. It is what it is. He and Tish were over before he started dating her."
After teaming up for a musical collaboration together in 2021, Firerose seemingly confirmed their romance in August when she paid tribute to Billy on his birthday.
"The world is a better place with you in it. Happy Birthday Billy❤️," Firerose captioned a photo of them.
Firerose and Billy Ray sparked engagement rumors when she posted a photo wearing a diamond on her ring finger on Sept. 13, 2022. It was later revealed that Billy had proposed the month before. "Billy looked at me and said, 'Do you, do you wanna marry me?' And I was just like, 'Of course I do. I love you,' " said Firerose, who later designed her own ring. "He said, 'I love you. I wanna make this official. I wanna be with you forever.' "
From her background as a singer to her biggest musical inspirations, here's everything to know about Billy's fiancée.
She's a singer-songwriter
Like Billy, Firerose is a singer-songwriter, noting on her website that she's had a "lifelong passion for songwriting" since she was young.
"I always believed that my purpose on earth was fulfilled by music," she wrote on her page. "And helping people up with a song I wrote gives everything so much meaning. I write from a place in my soul that's unexplainable and I'm incredibly grateful for this gift that allows me to touch people so profoundly."
She was born in Australia
Firerose was born and raised in Sydney, Australia to "a family of symphony musicians," per her website. She later moved to Los Angeles, California to pursue a career in music.
She graduated from Newtown School for the Performing Arts
While residing in Sydney, Firerose attended Newtown School for the Performing Arts, which is recognized as one of the "leading Performing and Visual Arts schools in Australia," according to the school's website.
Firerose/Instagram Firerose and Billy Ray Cyrus
She considers Billy Ray Cyrus her "mentor"
After releasing a handful of singles as a solo artist, Firerose got her big break when she collaborated with Billy on their track "New Day," which she said she "originally wrote to lift herself out of one of the darkest periods of her life."
While describing her 2021 collaboration with Billy, she called the "Achy Breaky Heart" singer her "longtime pal and mentor."
Her biggest musical inspirations include Sia and Alanis Morisette
On her website, Firerose lists a handful of her biggest musical inspirations, including Sia and Alanis Morisette, as well as Australian rock bands such as Powderfinger, INXS and Silverchair.
She got engaged to Billy Ray Cyrus in August 2022
After a few months of speculation, Billy confirmed to PEOPLE on Nov. 16, 2022, that he and Firerose were engaged. "She's the real deal," Cyrus said.
About a month prior, Billy and Firerose shared a series of selfies on Instagram. The caption, "Happy Autumn🧡," didn't distract fans from the large diamond on Firerose's ring finger. However, Billy's rep had no comment on the couple's engagement at the time.