Kirk touched down in South America in the early hours of today (3 March) and shared a selfie from his hotel bed.
The Essex-born reality star is hoping to raise thousands of pounds in sponsorship for this year's Sports Relief and can't wait to get cracking on his challenge - climbing Macchu Picchu.
Alongside the picture, which he posted on Twitter, Kirk told his followers: "Finally at my hotel in Lima Peru, can't wait to start this trek!!!! #perutrek14 @sportrelief."
Kirk is also fundraising for the ADHD Foundation which, as a sufferer, is a charity close to his heart.
Throughout his long journey, Kirk has kept fans updated with several snaps. In one, the star can be seen with his backpack on while wearing a Sports Relief T-shirt.
Kirk tweeted another selfie during one of his several plane journeys. Commenting, he said: "2nd flight of the day! Atlanta to Lima!!!"
Kirk will be joining a group of trekkers to scale the 15th Century Inca site and he is hoping to have completed it by 11 March.
Announcing his plans last month, he said: "I am really excited to be taking part in this charity climb and so pleased to be raising awareness for the ADHD Foundation, which does so much to help young people and their families living with ADHD.
"As someone who suffers from ADHD, I know first-hand how difficult it can be growing up with the illness and how challenging it can be at times for the families and friends of sufferers."
We're glad you made it safe and well, Kirk. Good luck!
To sponsor Kirk, visit his Virgin Money Giving page here.