The 39-year-old pop icon took to Instagram on Thursday to share a message with her fans regarding the injection.
"The people on the internet said it was really, really bad like a bullet going through your arm," she said alongside her boyfriend Sam Asghari. "It was nothing, I felt nothing."
The "Toxic" singer added: "I'm fine and I hope I continue to stay fine."
She and Asghari, 27, then swapped an ecstatic high-five.
"Got the COVID vaccine," Spears captioned the post, adding a reference to the movie "Borat": "Great success …. High-five !!!!!!"
Fans were glad to see the star receive a vaccination.
"Protect our Princess of pop at all costs!!" wrote one.
"QUEEN OF VACCINES," said another.
Added a third: "If Britney says you should get the Covid vaccine, YOU HAVE TO GET THE COVID VACCINE."
Yet another said, "OUR QUEEN IS SAFE!"
Just a day before getting vaccinated, Spears shared a video to Instagram more in line with her usual fare, featuring herself dancing while wearing various outfits.
One of the outfits sported by the star was a sheer, skintight leopard-print catsuit.
"I found my cat suit," she wrote in the post's caption. "No luck finding my mask but at least I found my body !!!!"
The singer continued: "Stay joyful my friends and do what makes you happy by darn it !!!! God bless."
Before showing off the catsuit, Spears donned a white top, green skirt, white socks, dark-colored boots and a motorcycle jacket with a sherpa lapel.
Additionally, a pink floral dress with heels made it into the video, as did an all-white outfit that showed off the star's toned abs.
Spears received plenty of praise for all of her outfits in the comments.
"I love the green skirt outfit!" said a fan.
"The first look is soooo amazing," a follower wrote.
"I need that bodysuit immediately," a third added. "Looking good Brit!!!"