As seen in fan-shot footage uploaded to social media, Aguilera gave a riveting live performance of her hit "Fighter" while rocking a skintight, striped black corset bodysuit with a cropped blazer-like piece over it that featured a long train.
To top this look off, the mom of two added thigh-high black leather boots. She later removed the other item to reveal the bodysuit in all its glory.
For her glam, she wore her signature platinum blonde tresses down and parted to the side in a chic shoulder-length bob.
Another notable ensemble from the night was Aguilera's similar nude corset bodysuit with matching boots, which she wore while belting the lyrics to "Your Body."
To complete that risqué look, the Burlesque star and style icon added dazzling, layered silver chain necklaces.
While treating the audience to an impassioned live version of her beloved track "Beautiful," Aguilera dazzled in a more romantic and artful get-up.
This included her favorite elements — like a black corset piece and striking edgy boots — as well as rose-adorned, detachable red long sleeves with a connecting, mesmerizing scarlet train that followed her as she walked across the stage.
Last but not least, we also couldn't take our eyes off the "What a Girl Wants" artist's glittery, skimpy and fun silver minidress that she sported later on during the evening.
Aguilera accessorized with oversized black Gucci shades, opera-length black leather gloves and her go-to thigh-high kicks that emphasized her recent weight loss.
After breaking the internet with a career-spanning setlist and impeccable concert outfits, Aguilera took to Instagram on January 3rd to tell fans that she had to postpone upcoming residency dates for this upcoming weekend.
"AFTER WELCOMING YOU ALL TO THE NEW YEAR FROM THE STAGE IN LAS VEGAS. I'VE BEEN WELCOMED WITH A NEW YEAR FLU!!!" she wrote in a story post for her 9.5 million followers.
"I AM SORRY TO SHARE THAT MY TWO SHOWS THIS WEEKEND WILL BE RESCHEDULED WHILE I REST - AND I CANNOT WAIT TO BE BACK ON THAT STAGE IN A FEW WEEKS," she continued.
"I'M INCREDIBLY PROUD OF THIS SHOW AND GRATEFUL FOR ALL THE SUPPORT AND LOVE AFTER OPENING WEEKEND! SEE YOU SOON."
On New Year's Day, the "Dirrty" crooner also thanked fans for their support shortly after her smash-hit opening weekend. "Tonight marks the beginning of a new chapter. I couldn’t think of a better way to bid farewell to this incredible year than to spend this night in LAS VEGAS with all of you, surrounded by your energy and enthusiasm," she wrote in her post.
"Cheers to the magical moments we’ll create, the music that will fill our hearts, and the endless possibilities that lie ahead."
Get well soon!