The pop star beat out Katy Perry and her own ex-boyfriend Justin Timberlake for the trophy, but don't worry, it doesn't sound like there is any bad blood between Brit and her very famous ex.
In a recent interview, Britney even named him as one of her inspirations.
"Bruno Mars is so different and fresh, and Justin Timberlake is, too," she told USA Today. "It's inspiring for me, and it makes people eager to listen to music, which helps everyone."
Britney, who is currently starring in her own Las Vegas show, posted an adorable picture of herself still holding on tight to the award as she got in her car to head home.
"OMG! Thank you so much for choosing me as your Favorite Pop Artist! I love y'all so much! Xo!" she wrote.
It's neat to see that after so many years in the industry and so many accolades, Britney is still so humble and appreciative!
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Gallery | Britney Spears Through the Years