Don’t annoy Lady GaGa.

It’s a lesson producer Calvin Harris learned the hard way, after the ‘ARTPOP’ superstar sunk her infamous paws into him Twitter moments ago.

Full story below…

Ever outspoken, Harris -who produced Rihanna‘s megahit ‘We Found Love’ – recently went on record to state that he turned down working with a then-unknown GaGa due to being too busy and the fact that “didn’t really like the songs”.

The hitmaker, who is presently promoting new album ’18 Months’, recalled the episode saying:

“When Lady Gaga first came out, her name rang a bell, so I checked my emails – and it turns out that on January 1, 2008, I got an email asking to work with her.

I thought, ‘Lady Gaga, what sort of name is that?’ So I replied saying, ‘Nah, I’m not into that.’ Fast forward a year and she’s the biggest thing. But I don’t regret turning her down as I didn’t think the song I heard then was that good.”

It appears, however, that GaGa has a grossly different version of events. For, she took to Twitter moments ago saying…

TKO, much?