Adam King on Friday night's Late Late Show. The Late Late Show Twitter

President Joe Biden has written to a six-year-old Irish boy who stole the hearts of the Irish nation when he appeared on the Late Late Toy Show last year. 

Adam King, who suffers from brittle bone disease, went viral after his appearance on the show last November thanks to his heartwarming "hug for you" card that he made for host Ryan Tubridy. 

Earlier this year, Valentine's Day cards based on Adam's virtual hug drawing raised more than €250,000 for Cork University Hospital Charity and Children’s Health Foundation Temple Street.

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Adam and his family appeared on the final Late Late Show of the season on Friday night, where he revealed that Biden had sent him a letter praising him for spreading "a wonderful symbol of hope and joy" with the virtual hugs. 

"I send you my best wishes from the United States of America," Biden wrote. "On St Patrick’s Day your Taoiseach Micheál Martin told me about the great work you have been doing, and most importantly your virtual hugs.

"They are a wonderful symbol of hope and joy, and have helped many people during these difficult times.

"You have already inspired the Irish people and the world with your message of connection, I hope you continue to share love and virtual hugs around the world," Biden continued. 

Adam's family revealed that Biden's letter was hand-delivered to the six-year-old by Taoiseach Micheál Martin in recent weeks. 

Adam revealed in November that he has a huge interest in space exploration and that he wanted to become CAPCOM at NASA when he grows up. Biden encouraged him to "work very hard" and do his best in school if he wanted to achieve his dreams. 

The President also sent Adam a special gift of an Irish flag and an American flag that had gone to space. 

Adam's brother Danny told Ryan Tubridy that the gesture was "really cool" and that the family had already framed both flags. 

Biden signed off the letter by sending Adam a virtual hug of his own. 

Meanwhile, the six-year-old also met two-weight world boxing champion Katie Taylor during his Late Late Show appearance on Friday. 

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Taylor provided the King family with some Olympics merchandise and a signed poster and also described Adam as an "inspiration". 

"You're so brave and you've given every single person so much hope," Taylor told Adam. "It just shows that you don't need a gold medal to be a hero". 

Taylor also said that she plans to bring one of Adam's virtual hugs to her next fight.