After much anticipation, the 29-year-old singer stepped out to the 61st Annual Grammy Awards on Sunday, sporting a stunning number from Monsoori.
Rexha rocked the red carpet in plunging red dress with tulle, accessorizing with a stunning diamond necklace and matching earrings and bracelet.
Her beauty look was equally glam. The singer -- who is nominated for Best New Artist and Best Collaboration for "Meant to Be" with Florida Georgia Line -- kept her hair pulled back in a beautiful updo.
"I'm wearing Monsoori!" Rexha confirmed to ET's Sophie Schillaci. "He won Vogue Arabia's No. 1 designer and he worked with my body and I feel amazing."
"I wanted to go for a princess look, but not only that, I had Karl Lagerfeld, Jeremy Scott, Moschino, Christian Siriano and Michael Costello all send me stuff and that was really awesome," she continued. "I really didn't expect that, so my size 8 a** is here on the red carpet."
She also joked that a "secret" about the gown is that "I can have a burger and I can eat and you won't see it."
Many fans and fashionistas were wondering which designer Rexha would choose to wear for the big night after she claimed via Instagram last month that a few unnamed designers refused to dress her for the ceremony for being "too big."
"So I finally get nominated at the GRAMMYs and it's like the coolest thing ever. And a lot of times artists will go and talk to designers, and they’ll make them custom dresses to walk the red carpet," Rexha explained at the time. "So I had my team hit out a lot of designers, and a lot of them do not want to dress me because I'm too big. Literally, like, I'm too big."
"If a size 6/8 is too big then I don't know what to tell you," she continued. "Then I don’t want to wear your f**king dresses. Because that's crazy. You're saying that all the women in the world that are size 8 and up are not beautiful and they cannot wear your dresses."
Rexha concluded her video by sending a message to those designers: "To all the people that said that I’m thick and I can't wear dresses, f**k you, I don’t want to wear your f**king dresses."
The post came nearly three months after the platinum blonde beauty exclaimed she was "Size 8 and Proud."
"Wanted to always be a skinny pop star but I'll never be that," Rexha captioned a sexy photo of her backside. "So to all the designers, don't send me sample sizes. They won't fit and I won't change myself to make them fit. Work with me and my big fat a**."