First there were rumors that Miley Cyrus was dating youngest Jonas Brother Nick. Now rumors are swirling that middle Jonas Brother, Joe, is dating country singing sweetheart Taylor Swift.

Even though Taylor, 18, has said that Joe is just a friend, he did turn up at her concert Sunday night in West Palm Beach, apparently without his brothers Kevin and Nick. Taylor was opening for Rascal Flatts at the Cruzan Ampitheatre.

We hear that Joe, who just celebrated his 19th birthday, tried to "hide out" in the crowd by wearing a baseball cap and casual clothes. Fans were onto him, however, and YouTube is filled with videos featuring clips of Joe, wearing a baseball cap, standing near the stage.

Some fans are thrilled that the two may be an "item," but only time will tell if they are -- and that is if they are willing to come clean. Lots of celebrity couples try and keep their relationships out of the spotlight.

Joe isn't the only one who has been spotting dropping in at concerts, however. Taylor was a surprise guest at a couple of recent Jonas Brothers concerts and she shot a cameo for the Jonas Brothers upcoming 3-D movie.

Joe talked to Ryan Seacrest on August 5, and when Ryan asked him if he was dating Taylor, Joe replied, "She's a great girl... I think anybody would love to go on a date with her." Well said Joe, see you at the next Taylor Swift concert!

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