The British actor, 44, and the global music sensation, 35, had a brief relationship back in 2016
The duo called it quits after only around three months, with the split rumoured to come down to the public nature of their romance.
Tom, who was on the radio programme with actress Karen Gillian, 37, was expecting to discuss his upcoming film, “The Life of Chuck”.
So when the radio host name-dropped his famous ex, he was more than taken aback.
Taylor entered the conversation after the host of the show asked Tom how he liked to spend his nights, and he remarked on how he enjoys watching sports highlights.
“I find myself on the sports highlights. It’s football, or if there’s been a tennis championship that I’ve missed,” Tom said.
“I’ll go on to read what all these sports journalists have said about sport who write really beautifully about it. I love reading what they’ve written. It’s kind of nerdy.”
The Heart host then threw in a complete curveball of a question, relating to how Taylor recently discussed both sports and her love of baking sourdough on her boyfriend Travis Kelce’s podcast, New Heights.
“We did just find out Taylor Swift is a big fan of a sourdough recipe blog. Very, very specific, but I could see how you could get into that,” remarked the host.