Dappy helped save a fan's life after chatting to the man for '10 minutes' and talking him down from London's Tower Bridge.
The N-Dubz star, 34, is thought to have been filming a music video when he was recognised by the man, 27, and invited under a police cordon to try and help.
Speaking with The Sun, a source said: 'Dappy told him life was beautiful, and that things would get better basically... He's been an absolute hero.'
'He's been a hero': Dappy helped save a fan's life after chatting to the man and talking him down from London's Tower Bridge (pictured in 2018)
The source claimed that Dappy was around Tower Bridge filming when he noticed lots of emergency services and the area being closed off.
Police asked Dappy - real name Costadinos Contostavlos - to leave the area while they were dealing with an incident but the musician ended up helping after being recognised as a rapper.
The source said: 'As he was walking away, Dappy heard this young guy shouting his name and waving frantically as he was perched precariously in an arch directly over the Thames.
'After telling a constable he was a fan, Dappy was invited under the cordon to try.'
Incredible: The N-Dubz star, 34, is thought to have been filming a music video when he was recognised by the man, 27 (pictured with bandmates Tulisa and Fazer in 2010)
They then spent around 10 minutes talking, with Dappy thought to have told the man that 'life is beautiful' before medics were able to get the man down.
The source added that after being released from hospital on Thursday the man and his grateful sister sent their thanks to the star in a message.
Dappy also referenced his incredible actions on Instagram on Friday, re-sharing a post about what happened and adding: 'I weren't even gonna say nothing but yoooo'
The original post penned by his girlfriend Imanie read: 'I truly believe the universe sent us to that bridge so that Daps could save this young man's life. A soon as he recognised Daps his whole demeanour changed, we saw hope appear in his eyes..
Helping: Dappy is thought to have spent around 10 minutes talking to the man before medics were able to help him down from the perch (stock picture of Tower Bridge)
Humble: Dappy also referenced his actions on Instagram on Friday, re-sharing a post from his girlfriend about what happened and adding: 'I weren't even gonna say nothing but yoooo'
'We Save Lives Too': Dappy also shared a series of snaps taken at Tower Bridge to social media
'Daps told him his life is precious and that he loves him… he talked him off the bridge… the man and his family reached out and he is alive and well'.
He also shared a selection of snaps taken at Tower Bridge, including the hashtag We Save Lives Too.
MailOnline has contacted Dappy's representative for further comment.
Dappy shot to fame as part of trio N-Dubz from 2000-2011, with the band having hit tunes including Papa Can You Hear Me? and Playing With Fire.
He is now working on his solo music, recently releasing single, Bolo featuring Abra Cadabra, which will feature on record fortune which is set to be released on June 25.
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Rapper: Dappy shot to fame as part of trio N-Dubz from 2000-2011, with the band having hit tunes including Papa Can You Hear Me? and Playing With Fire (pictured in 2019)