Lopez, 39, talks about the two on his 104.3 MY FM radio show, airing Friday night, noting that he saw them together the previous day on the X Factor set in Los Angeles.
"Taylor Swift was the special guest performer, and [here's] a little inside scoop for you," the host tells his listeners. "During rehearsals, Harry from One Direction came and slapped me on the back, and said, 'Hey, Mario, how ya doing?' And I said, 'What are you doing here?' And he sort of [pointed] toward Taylor."
Later, Lopez adds, he saw the pop stars "walking off hand in hand. So Taylor Swift and Harry from One Direction -- you heard it here first. [They're] officially hanging out, I can say that much."
Swift -- whose exes include Joe Jonas, Jake Gyllenhaal, John Mayer, Taylor Lautner, and, most recently, 18-year-old Kennedy -- is currently making the rounds to promote her smash new album, Red. E! News first reported that the singer had been spotted with Styles yesterday, as she prepared for her Nov. 15 X Factor performance.
"Harry is there with her now," a witness told the site. "She is doing rehearsals this afternoon...He was sitting with her mom and the rest of her entourage."