Taylor Swift calls out ex, appears to mutter expletive during VMAs

Taylor Swift strikes again.

When the country-pop starlet accepted the best female video award for "I Knew You Were Trouble" at the VMAs on Sunday, she didn't just thank her fans, but she also gave a "shout-out" to the man behind the track. And it's not one of those good shout-outs.

"I also want to thank the person who inspired this song, who knows exactly who he is, because I got one of these," Swift said. "Thank you so much!" Was Swift referring to her ex, Harry Styles of One Direction perhaps? He was in the audience alongside his bandmates, as MTV cut to him following Swift's comment.

And then -- just in case we weren't sure just how Swift feels about Styles -- we were reminded. She was caught on video in a GIF that went viral Sunday night. In it, Swift appeared to be saying, "Shut the [expletive] up" to her seatmate and pal Selena Gomez as the members of One Direction spoke onstage.

Swift's "I Knew You Were Trouble" beat out out Miley Cyrus' "We Can't Stop," Demi Lovato's "Heart Attack," Pink's "Just Give Me a Reason" and Rihanna's "Stay."