The clip was widely shared, with Rowling tweeting: "Yes, watching Piers Morgan being told to f**k off on live TV is *exactly em *Good Morning Britain, was less than happy, alerting her to the fact he's never read a word of Harry Potter".
The Harry Potter creator hit out at Morgan over Twitter, she tweeted an article which praises her own work. Could the writer let me know who he is? I'd love to thank him!
#Valentines." The British journalist was quick enough to reply to this and addressed Rowling as "priceless #humblebrag BS", which is defined as "an ostensibly modest or self-deprecating statement whose actual goal is to draw attention to something of which one is proud".
The row began after Piers was criticised (in rather colourful language) by Australian comic Jim Jeffires on panel show Real Time With Bill Maher.
Rowling is now in a full-blown Twitter war with "Good Morning Britain" host and general loud mouth Piers Morgan, which kicked off this weekend. "[It] was exactly as satisfying as I'd imagined", she wrote.
Only his reaction backfired somewhat when it transpired the author of the kind words about creative and inspirational Rowling was none other than Morgan himself.
Yep, he'd written it for a piece titled "100 British celebrities who really matter" back in 2010. The answer was a resounding 55 per cent for Rowling, with only nine per cent of respondents siding with her opponent.
"Nobody plays the celebrity game more abusively or ruthlessly than you, Ms "Intensely Private Billionaire", he tweeted.