Cabello and Mendes will also be performing their new song, 'Señorita,' during the telecast.
The singer earned nominations for Best New Artist and Artist of the Year at the annual awards ceremony.
See Priyanka Chopra, Ciara, Bretman Rock, Hayley Williams and more at beauty's biggest event of the year.
The 'BH90210' star looked radiant in a yellow floral frock as the family posed for the camera at the 2019 Teen Choice Awards.
The actress announced she was expecting her second baby, with husband Adam Schulman, in July.
The two smiled, waved and shared a kiss while walking their first red carpet together at the 'Once Upon a Time in Hollywood' premiere.
See this month's standout looks from Hollywood's biggest stars.
See what J.Lo, Gigi Hadid, Emily Ratajkowski and more wore on the red carpet for the fashion-forward evening.
Lohan accused the singer of copying another celebrity's look with her Cinderella-style gown.
The singer hit the red carpet in a white, leotard-style outfit adorned with colorful jewels then wrapped herself in a snuggly fur coat.
The actress might be a famous movie star but that doesn't mean she enjoys the spotlight.
The actress also shared how excited she was to finally get to see the completed film.
The cute couple were all smiles at the star-studded premiere in L.A. on Monday night.
The hottest stars lit up the orange carpet in fierce and fun outfits at the annual Nickelodeon celebration.
