The former flames smiled for a photograph, with their mutual friend Ed Sheeran and another friend between them, at Robin Thicke's after-party following the annual awards show.
CLICK ON PHOTOS FOR FULL GALLERY
Just hours earlier Taylor had named her ex-boyfriend in her acceptance speech after winning Best Female Video at the MTV Video Music Awards in Brooklyn, New York on Sunday night.
"I want to thank the fans because I tweeted about this a lot, I really wanted this," said the 23-year-old after she was presented with her moonman trophy by Pharrell Williams and Daft Punk.
"I also want to thank the person who inspired this song because he knows exactly who he is, because now I've got one of these", she added, gesturing to the trophy in her hand.
The camera then panned to One Direction singer Harry, who was looking handsome in an open black shirt, jeans and jacket, his trademark tousled blonde curls still perfectly in place.
Taylor scooped the award for her song I Knew You Were Trouble, which was written following the pair's break-up after just a few months. The two are believed to have parted ways in February after a holiday to the British Virgin Islands went sour.
The Eyes Open singer was stunning for her award scoop – and ex-boyfriend swipe – at the VMAs, channelling her Hollywood screen siren look in a plunging, body skimming Hervé Leger number.
She sparkled in Lorraine Schwartz jewels, wearing her usually poker straight blonde locks curled into a Twenties hairstyle.