And the newly single star was looking absolutely smoking as she took to the red carpet in a plunging white frock that showed off her perfectly toned body.
With her hair smoothed back off her face, T Swift topped off her look with dramatic eye make-up for the complete 'here's what you're missing, Harry' effect.
Bet he's kicking himself now.
There was good news for Taylor though, as she picked up the award for Best Country Artist, but rather awkwardly she walked off the stage to the sound of One Direction's hit 'Live While We're Young'...
News the couple had split broke earlier this week, with reports the relationship ended after a blazing row during a holiday in the Caribbean.
Latest rumours have suggested that Taylor's nagging over his womaniser past was to blame for the split.
Harry and Taylor when they first went public with their romance in November
The Mirror also suggests that Taylor had a problem with his close friendship with ex-girlfriend Caroline Flack.
“Sadly it fizzled out just as quickly, and came to a head following a series of angry spats on holiday.
“Harry felt Taylor was nagging him, quizzing him on his intentions with various women and generally having very little faith in him."
They added: "It all became too much and Harry found her a little too demanding. Taylor probably engineered the split but Harry held all the cards in the relationship.”