The Do It Like A Dude singer, 34, who revealed that she is expecting a baby boy, looked incredible in a red textured crop top and matching skintight leggings.
The songstress put her blossoming stomach on display while posing for photos on the red carpet.
She made sure all eyes were on her in this showstopping ensemble – completing her look with an oversized crimson red ruffle coat and a pair of scarlet heels.
The pop star flashed a smile as she attended the star-studded event at The O2 Arena in London.
She styled her black tresses into a sleek updo and opted for subtle make-up and some gold chunky earrings.
The mum-to-be gave proudly showed fans her baby bump in the co-ord.
It comes after the singer revealed the gender of her unborn child in a sweet video of her singing while she got ready for her first Brit Awards in ten years.
She took to Instagram on Saturday to announce the news that her first child, who she is expecting with Chanan Safir Colman, is going to be a boy.
In the emotional clip, Jessie wore an oversized white shirt which she wore unbuttoned over her stomach to show off her growing baby bump.
Showing off her incredible vocal skills, she sang: “Something’s happening that I’ve been waiting for. I feel its weight, falling to the floor.”
Revealing her baby’s gender, she wrote: “Since I wrote this song every time I play it or sing it he moves like crazy… so I think this song is the one.
“Pre save link in my bio. Oh yeah…I’m having a boy. And I promise I am wearing underwear.”
It comes days after Jessie glammed up for a new shoot as she bared her pregnancy bump for another photo.
In the gorgeous images, Jessie sported a pink tie-dye bralet that show off her huge bump.
Jessie J announced that she is expecting her first child last month.
She recently celebrated her pregnancy with a baby shower – which included a very cheeky candle game and her rarely-seen mum.