Declan Donnelly has thanked fans for their support for TV partner Ant McPartlin amid reports he has checked into rehab to fight prescription drug and alcohol problems.
McPartlin says he has "let people down" and wanted to speak out about his issues so he could help others.
The 41-year-old star, one half of presenting duo Ant and Dec, told The Sun on Sunday: "I feel like I have let a lot of people down and for that I am truly sorry.
"I want to thank my wife, family and closest friends for helping me through this really difficult time.
"I've spoken out because I think it's important that people ask for help if they're going through a rough time and get the proper treatment to help their recovery."
McPartlin is believed to have checked into a rehabilitation facility, where he will remain for up to two months.
The paper reported that the star's problems were triggered by failed knee surgery two years ago.
McPartlin has an ongoing knee problem and is said to have started taking prescription drugs to ease the pain.