This star just seriously dissed her ex and his bad behaviour!

Singer Jordin Sparks has been relatively quiet about her break-up with Jason Derulo since they cut ties in September, but that doesn't mean she wasn't angry about how things ended.

Jason has spoken openly about the split, saying there had been a lot of "pressure" and "tension," and even admitting that the break-up happened over the phone.

Now though, Jordin has made her own statement with a pretty cutting new song called How Bout Now (Remix), released online yesterday.

The lyrics blast Jason's lack of effort and appreciation for his lady, with lines like, "You suck right now, you thought the little effort that you put in was enough."

Jordin brings up different things she did for her man, dissing him for not caring about her more. "Remember I deleted all my other guys' numbers out my phone for ya?," she sings.

Another verse references a neck injury which Jason received back in 2012. "Remember when you broke your neck and I had to wash your back for ya? You probably don't remember half of the s**t that I did for ya," the song goes.

Listen to the full version here:

Jordin's obviously been keeping her anger under wraps, as she appeared calm and happy in interviews following the break-up. "I'm good, actually," she told the Today Show at the end of September. "I read this quote [yesterday], and it said, 'When something unexpected happens in your life, or you think something bad happens, just say 'Plot twist!' and move on."

Or… you just write a fierce song about it and move on!