Piers Morgan's son made a very awkward confession during his father's spat with JK Rowling.

Piers Morgan's son made a very awkward confession during his father's spat with JK Rowling.

Piers Morgan and JK Rowling became embroiled in a Twitter row over the Good Morning Britain presenter's support of Donald Trump after he was criticised live on US television.

The Harry Potter author expressed glee at the broadcaster being sworn at by Australian comedian Jim Jefferies during an appearance on panel show Real Time With Bill Maher.

Discussing Mr Trump's attempt to stop people from seven Muslim-majority countries entering the US, Morgan said it is not a Muslim ban, to which Jefferies responded: "Oh, f*** off. It's a f****** Muslim ban."

Rowling wrote on the social networking site: "Yes, watching Piers Morgan being told to f*** off on live TV is *exactly* as satisfying as I'd always imagined."

Morgan replied: "This is why I've never read a single word of Harry Potter."

Rowling said: "Because you had a premonition that one day the author would roar with laughter at seeing you called out for your bullshit on live TV?"

However, while Morgan expressed his lack of interest in Harry Potter, his son Spencer made it clear just how much the fantasy series means to him.

"Well this is awkward," he wrote on Twitter, sharing an image of a Harry Potter-inspired tattoo he has on his arm, as well as wearing a matching necklace.

Morgan retweeted the post, while Rowling is yet to respond to it.

Rowling continued the spat by tweeting an article about her winning a British Book Awards public vote for book of the year, which saw her sixth Potter novel Harry Potter And The Half-Blood Prince triumph over Morgan's autobiography.

She captioned it #StillHurts, to which he responded #StillNeverGoingToReadYourDrivel.

The author also tweeted him: "If only you'd read Harry Potter, you'd know the downside of sucking up to the biggest bully in school is getting burned alive."

Despite claiming not to know her work, Morgan referenced the frumpy, evil teacher character Dolores Umbridge from the Potter books in his response.

He tweeted: "No bigger bullies right now than the shrieking, hysterical anti-Trump celebrity brigade.

"You lost, so suck it up Dolores."

Later, Morgan tweeted a smiling photo that he had posed for during The Apprentice alongside Trump which was captioned "Happy Saturday!"

PA Media