Taylor Swift appears today on The Ellen DeGeneres Show.

The taped interview includes Taylor expressing one major regret. A decade ago, she insulted an ex-boyfriend for dumping her in a 27-second message on her phone. Taylor told Ellen (quote) “When I put Joe Jonas on blast. That was too much. I was 18. Yeah. We laugh about it now but that was mouthy, just some teenage stuff there.” (Just Jared)