Kirk arrived in London on Wednesday night (12 March) and was presented with a hard copy of his debut charity single, 'Ain't No Sunshine'.
A proud Kirk tweeted: "Was great to be met at the airport yesterday by my manager @KRYSTAL_PR_ with a copy of my 1st ever single!"
Once home, Kirk told fans: "Feels so good being back at home and not sleeping in a tent!" He later added: "Feels weird waking up and not having to climb a mountain lol."
Kirk trekked the 15th century Inca site at Machu Picchu to raise money for this year's Sport Relief campaign and the ADHD Foundation, which is a charity close to his heart.
After finishing his trek, Kirk prepared to make his way back home and remained in good spirits despite losing his luggage after jetting to Lima to catch a connecting flight to the UK.
Last month, Kirk wowed fans after previewing a snippet of 'Ain't No Sunshine' - which is a cover of Bill Withers' 70s hit - during an interview on BBC Radio 1Xtra.
His singing ability shouldn't come as too much of a surprise though, as TOWIE fans will remember that Kirk did a pretty good job at singing a swing number when he took part in the show's festive one-off live episode in December 2012!
'Ain't No Sunshine', which will act as the official ADHD Foundation charity single, is due for release on 24 March. It is available to pre-order now.
Got an iPad or iPhone? Reveal Mag has been especially designed to fit!