It looks like Taylor Swift may still be bitter over her break up with One Direction's Harry Styles as she was caught mouthing the "F-bomb" to Selena Gomez as the boy band gave away a moonman at the VMAs.

The 23-year-old "22" singer who is known for making hits out of failed relationships dissed her ex-boyfriend once again while at the 2013 MTV Video Music Awards at the Barclays Center in Brooklyn, New York. However, we doubt she meant for her personal comment to get air time.

While Styles and his One Direction bandmates took the stage to present an award, Swift, who was sitting with Gomez, was filmed mouthing, "Shut the f--- up!" in the audience as One Direction spoke.

Taylor Swift previously insulted Harry Styles by speaking in a British accent during her "We Are Never Ever Getting Back Together" performance at the Grammy Awards back in February. Clearly the star wasn't done being rude to her ex.

The couple split in early January after only a of couple months of dating. As the awards ceremony progressed, the singer accepted an award for her hit "I Knew You Were Trouble," which is rumored to be inspired by her break up with Jake Gyllenhaal.

According to Us Weekly, Swift said, "Thank you. Wow. I want to thank the fans because I tweeted about this a lot, I really really wanted this."

She continued her acceptance speech for Best Female Video, "I also want to thank the person that inspired this song, and he knows exactly who he is, because I got one of these!"

When the camera cut to Harry Styles, the "Best Song Ever" singer looked on from his seat into the audience, according to the magazine.

Styles recently told Us Weekly that he has accepted Swift's decision to write about their failed romance. He said, "It would be hypocritical for me to say she couldn't do it because everybody writes songs based on personal experience."

He went on to say, "I can't say I'd have dated someone less famous to avoid it."

Click below to see Taylor Swift drop the "F-bomb."