WATCH: Taylor Swift disses ex in MTV VMAs speech - the look on Harry Styles' face says it all!

Taylor Swift mouthing off at an ex? Why, we'd never have thought!

Taylor won Best Female Video for 'I Knew You Were Trouble' at the 2013 MTV Video Music Awards today, and took the opportunity to make a dig at an ex-boyfriend during her acceptance speech. Watch the moment above!

Exactly one second after Taylor's zinger, the camera cuts straight to Tay's ex Harry Styles, who looks awkward, nervous, smug, bemused, and in our humble opinion, just a little bit GUILTY of breaking Taylor's heart. Just sayin'. Check out how his One Direction band mates react too. It's pretty hilarious!

Tay-Tay fans have long maintained that the song is about ladies' man Harry. And hey, remember how she put on that English accent at the Grammys back in February? Trouble, trouble, that Harry Styles.

Earlier at the 2013 VMAs, the 23-year-old was caught whispering what looked like "shut the f--- up" to Selena Gomez as One Direction thanked their fans on stage, and proceeded to give Selena her award for Best Pop Video for 'Come and Get It'. Oops!

Red carpet: 2013 MTV Video Music Awards

THIRD DAY Make a difference tour
Touring in Feb