Rylan Clark-Neal has now raised more than £1 million for Children In Need by singing non-stop karaoke for 24 hours.
The presenter belted out 231 songs, assisted by more than 90 celebrity guests, including Rick Astley, Nicole Scherzinger and Craig David.
He ate spoonfuls of honey every hour to keep his vocal cords coated - along with the occasional Pudsey donut.
"I am in such a state," Clark-Neal told Radio 2's Zoe Ball as he approached the end of the challenge on Wednesday.
"It doesn't feel real. None of it feels real."
The crooning marathon was broadcast live on BBC Radio 2 and the BBC red button. In the last half hour of his challenge the star raised more than £200,000 - with the tally reaching £845,239 by the time he finished at 09:15 GMT.
"That's unbelievable, thank you so much," said the star.
Donations continued to flood in after Rylan took a well-deserved rest, taking the tally past the £1 million mark by Thursday morning.
"That sore throat today is totally worth it, @Rylan!" tweeted Radio 2. "We are so incredibly proud to announce that we've hit ONE MILLION POUNDS (£1,027,776 to be precise!)"
The final grand total will be revealed during Friday night's Children In Need broadcast on BBC One.
Rylan's challenge saw him duet with Dermot O'Leary on You Don't Bring Me Flowers, rap with Trevor Nelson and DJ Spoony on a version of Rapper's Delight, and dance with Strictly contestants Saffron Barker and AJ Pritchard.
Rylan said he was inspired to keep singing by the memories of a recent visit to a Children In Need-funded youth club.
Buckets of love from the bottom of my ❤️ to every @BBCRadio2 listener, young & old, who has donated to @BBCCiN. So proud of @Rylan, loved him before but so much respect baby. Hope he has a good lie down. Thank you to little Cain & his mum Lisa for coming in this morning 💛 Zo x— Zoe Ball (@ZoeTheBall) November 13, 2019
The star met the disadvantaged children helped by the Southend Association of Voluntary Services (Turning Tides) project in Essex - playing Hungry Hippos and taking part in arts and crafts lessons.
"It was amazing and, do you know what, I didn't actually think about this when I signed up to do this," said the Strictly: It Takes Two presenter.
"I didn't really think that I would need that, but actually visiting the project and meeting all the kids and volunteers and speaking to them and understanding how much this money impacts their lives, when I am sort of dying at four o'clock in the morning trying to garble together a song I know what I'm doing it for now."
His final song was Tina Turner's The Best - for which he was joined by M People star Heather Small.
As it ended, the 31-year-old sank to the floor in relief and Zoe Ball played him the bells of St Margaret's Church in his hometown of Stanford-le-Hope, Essex, which were ringing in his honour.
Rylan's charity feat came eight months after Tess Daly and Claudia Winkleman danced non-stop for 25 hours on Radio 2 in aid of Comic Relief.
In 2017, Sara Cox also boogied for 24 hours in an 80's Danceathon, while Dermot O'Leary kicked off the challenges in 2015 with another 24 hours of dance - live on the plaza outside BBC New Broadcasting House.