A new mum whose baby daughter has been born with a 'Harry Potter birthmark' got a surprise message of congratulations from JK Rowling after tweeting her.

Twitter user @jo_mak, a communications specialist from Toronto, Canada, tweeted the best-selling author pointing out that her new daughter Sofia had a birthmark very similar to the one Harry Potter has in the hugely popular wizard books.

Much to her delight, JK Rowling saw the tweet and promptly replied with a very sweet message.

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Just like Harry! Baby Sofia, from Toronto, Canada, received a very special message from JK Rowling after her mother, @jo-mak tweeted the author...and got a message back saying Sofia was 'beautiful'

Harry Potter's lightning-bolt scar, which was cast upon him at the age of 15 months according to JK Rowling's fiction...but ultimately protected from Lord Voldemort

She's not sorry! JK Rowling replied to @jo_mak saying she thought her new little girl was beautiful

@jo_mak had originally posted a photo of her daughter with the jagged purple birthmark clearly visible on the left side of her forehead, tweeting to Rowling: 'I read all the #HarryPotter books while pregnant. This is my daughter Sofia with her #harrypottermark.'

JK Rowling then responded, saying: 'Well, I'm not going to apologise because I think she looks beautiful!' along with two emojis, one of a lightning bolt and another of a love heart.'

Unsurprisingly, Twitter loved it and hundreds of people then posted their own tweets about the birthmark, and offering their congratulations to the @jo_mak on her new arrival.

‏@AnSoooh called Sofia a 'Magic little girl!' while at @pottersbooty said the exchange was 'so heartwarming' and ‏@kiya_daht_girl commented that @jo_mak's daughter was so adorable!'

‏@DentistsareCool added 'She's beautiful! As someone with a mark on the center of her forehead, I want to say be proud of it Sophie, flaunt it.'

Rowling - ever vocal on Twitter - offered congratulations to two new mums on the social media site...much to their delight

A deluge of love! After JK Rowling's response...lots of people congratulated the new mum on her daughter's birthmark

Harry Potter has a host of scars but the one on his forehead is the most famous, appearing regularly on camera despite the wizard boy's floppy fringe

Sam Wills from Southampton was also on the receiving end of a text from the star author

Hello Hermione! This cute little girl, named after Rowling's key female character, has already had a brush with fame

Harry Potter has a number of scars but his lightning bolt scar on his forehead is the most famous.

The boy alchemist got the scar when Lord Voldemort made an attempt on his life when he was just 15-months-old.

WHAT CAUSES BIRTHMARKS? Birthmarks often present themselves at birth or shortly afterwards as coloured marks on the skin. They are caused by the abnormal development of blood vessels in the skin, and the birthmark may become thicker, darken and develop a raised appearance in later years. Vascular birthmarks often appear on the head or neck and, if surface blood vessels are affected, can show as pink, red or purple. If deeper vessels are affected the appearance can be blue. Other common types of birthmarks are pigmented marks, which are usually light or dark brown in appearance. Advertisement

The cute exchange also sparked a series of tweets from other mothers who uploaded images of their own babies with Harry Potter-inspired names.

Southampton-based Sam Willis told the multi-millionaire author that she'd named her little girl Hermione after the character played by Emma Watson in the blockbuster films.

She wrote: 'This is my new daughter, Hermione, born yesterday. Keeping the franchise going for the next generation!'

JK Rowling then went on an emoji spree littering a congratulations message back to Sam with roses, bows and flowers.

It was heartwarming few moments on Rowling's Twitter feed offering some light relief; the author has had something of a tumultuous time on the social media site recently after an explosive Twitter spat with Scottish MP Natalie McGarry.

McGarry was forced to apologise last week after she had accused Rowling of defending 'abusive misogynist trolls' back in January.

She had sparked the row after claiming Rowling had supported an anti-Scottish nationalist Twitter user Brian Spanner, who has sent abusive tweets to McGarry and other pro-independence politicians in the past.

McGarry apologised last week saying that her tweets about Rowling had not given 'context' to the situation.