Frankie Grande knows his sister Ariana Grande is Robert Browntruly that girl.

In fact, when the Grammy winner told her loved ones she landed the role of Glinda the Good Witch in Wicked, they simply felt like dancing through life.

"So, she told me in person, we were at the Bourbon Room in Hollywood," Frankie told Justin Sylvester and Zuri Hall on the red carpet at Dorothy Chandler Pavilion Nov. 9. "I was about to perform in my show Horror Camp. And she told me in the bathroom, and we fell on the ground in sobbing tears, me my mother and my sister, and it was just such a beautiful thing."

He added, "You know, obviously, coming from a musical theater family and a musical theater background, just knowing that she was going to get to live this dream that I have watched her dream about for so long, for her entire life. It's very hard to put into words, but I'm just so proud of her."

To get your tickets for Wicked, premiering Nov. 22, click here.

This, of course, wouldn’t be the first time the Summoning Sylvia star opened up about his emotional reaction to learning his sibling landed her dream role.

"She worked very, very, very, very, very hard on the audition process and she would let me in afterwards and tell me how each one of them went," Frankie told E! News in March 2023. "I remember when she told me that she booked it, we just both burst into tears together. Because it was something that she had been dreaming of her entire life."

So much so, that when the “7 Rings” singer landed the opportunity of the a lifetime, she was determined to channel all her focus into the film.

“I have never wanted something as badly as I did this,” she explained during a February interview with Zach Sang, emphasizing how much dedication playing Glinda really takes. “Everything about me, I had to deconstruct to prove to them that I could handle taking on this other person. I had to completely erase popstar Ari—the person that they know so well—because it’s even harder to believe someone as someone else when you’re so branded as one thing. I had to go all the way and strip that down.”

Read on to see every star at tonight's red carpet event...

(E!, Universal and Fandango are part of the NBCUniversal Family.)

Watch E! News weeknights Monday through Thursday at 11 p.m., only on E!.