The "Shake It Off" singer appeared on "The Ellen DeGeneres Show" in 2008 to promote her album "Fearless" and when asked if any of the songs were about the Jonas Brothers star, who was thought to be her boyfriend at the time, Taylor revealed they weren't together anymore because he had broken up with her over the phone.
The "ME!" hitmaker returned to the same talk show for Wednesday's (May 15) episode, and when asked for "the most rebellious thing she did as a teenager" during a round of "Burning Questions", the 29-year-old confessed she might have gone a bit far 11 years ago.
"Probably when I like put Joe Jonas on blast on your show," she replied. "That was too much, that was too much... I was 18, yeah. We laugh about it now, but that was mouthy, yeah, some teenage stuff there."
Ellen added that the singer must have "held onto" the moment because she doesn't remember it.
Back in 2008, the talk show host asked Taylor if any of the songs on "Fearless" were about Joe, who is now married to "Game of Thrones" actress Sophie Turner, and she dropped the bombshell when discussing the track "Forever & Always".
"There's one (song) that's about that guy, but that guy's not in my life anymore, unfortunately. That's ouch," she revealed. "We haven't talked since, but you know what, some day I'm gonna find someone really, really great who's right for me ...When I look at that person, I'm not even going to remember the boy who broke up with me over the phone in 25 seconds when I was 18."
During the "Burning Questions" segment, the popstar, who is dating actor Joe Alwyn, also revealed that she eats in her sleep.
"I go downstairs and rummage through the kitchen and eat whatever what I can find. It's really less human being and more like a raccoon in a dumpster," she shared. "I don't really remember it, but I know it happens because it could only have been me... or cats."