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Joe Jonas, Taylor Swift

Dimitrios Kambouris/Getty Images, Jerome Ware/ZUMPress.com

Joe Jonas appears to be more than just friends with country singer Taylor Swift. At the very least, he's a devoted fan.

Joe, 19, attended Swift's concert at the Cruzan Amphitheatre in West Palm Beach, Fla., Sunday night, E! News has learned exclusively. Swift, 18, was the opening act for Rascal Flatts.

"He arrived about five minutes before the show started and stood next to the soundboard," says Mishelle Rivera, assistant promotions director at Miami's Y100 radio station, who watched the concert just a few feet from the middle Jonas.

"He was wearing a Yankees baseball hat and trying no to be noticed. He was really into the show. You could tell he was really focused on her."

Rivera says that Joe rarely took his eyes off Swift during the entire hourlong set and that he immediately went backstage to see Swift following the show.

Joe took time off from his busy touring schedule to make the show. He played a concert with his brothers in Holmdel, N.J., Saturday night and tonight will play at the Verizon Wireless Amphitheater in Virginia Beach, Va.

Swift, who earlier in the week shot scenes with the Jonas boys in NYC for their new movie, mentioned Joe in her most recent blog: "I’ve had an awesome week, I’ve been in NYC shooting for the Jonas Brothers 3D movie. It’s been so much fun! We stayed right across from Central Park and I could see the whole city every time I looked out my window."

Ryan Seacrest asked Joe Aug. 5 on his KIIS-FM show if Joe and Taylor were together, to which he replied, "I think anyone would like to go on a date with her."