In September, Normani appeared at Rihanna's massive fashion show in Brooklyn, where she launched the latest collection of her Savage X Fenty lingerie line.
Now she's joined the band in a more permanent capacity.
Normani posted a photo on Instagram showing her modeling a red lace bra, panties and stockings by Savage X Fenty.
"I’m the first ever brand ambassador for @savagexfenty !!! I love you @badgalriri," she wrote.
Normani added, "I want all individuals to feel empowered and to embrace who they truly are. I don’t always wake up feeling the most confident and powerful, but trust and believe having my Savage X on always helps!!"
Rihanna tweeted the same video and wrote, "Welcome to the family sis! Honored to have you!! @Normani."
After touring with Ariana Grande earlier this year, Normani is spending the first part of December performing at holiday radio shows. She's also featured on the "Charlie's Angels" soundtrack, on the song "Bad to You" with Grande and Nicki Minaj.