THE JONAS BROTHERS have confirmed that NICK JONAS wrote "Wedding Bells" about MILEY CYRUS and her engagement to LIAM HEMSWORTH.

Earlier this month, Miley said she figured the song HAD to be about her.  But she didn't mind, because she understands that when you date an artist, or a songwriter like Nick, they may use that experience as inspiration for their work.

In a radio interview yesterday, KEVIN JONAS said, quote, "I think she put it really well, she's absolutely right, when you're with someone who's an artist, it's just about being open and honest about the fact that your life is what you have to write about sometimes, and pull from that life inspiration."

Nick did NOT comment, although he said a lot about the song before debuting it in concert. 

Along those lines, earlier in the interview JOE JONAS said he's cool with his ex-girlfriend TAYLOR SWIFT . . . despite the fact that she TORE INTO HIM a few years ago, on her song "Forever and Always".

On Ryan Seacreast's show, he said, "Everything's great.  I'm really happy for her continued success."  Joe was recently seen talking to Taylor backstage at the iHeartRadio music festival.