Piers Morgan has penned a warning to his friend Katie Price, urging her to get her life back on track for the sake of her children.
In his column for The Sun, the 57-year-old broadcaster wrote that Price, whom he has known for 20 years, is "spiralling completely out of control" with her recent actions.
Read more: Katie Price's biggest reality TV shows
He said: "You’re a straight talker like me, so let me be brutally frank: you’re spiralling completely out of control, and this won’t end well if you don’t wake the f*** up pretty damn sharpish and pull yourself together."
Morgan wrote that Price appears to be "on a deluded one-woman mission to self-destruct", amid bankruptcy, drug use and rumours that she has cheated on her fiancé.
Morgan said he was terrified when he read about Price's drink-drive car crash in September and worries what might happen in the future.
He pointed to the revelation that Price has purchased a custom-made pink Ferrari this week, despite not being legally allowed to drive it.
Read more: Katie Price's mum reacts to crash
Morgan wrote: "Almost all of [your problems have] been entirely self-inflicted during a lengthy self-indulgent orgy of reckless, selfish, criminal behaviour that has made even your biggest supporters – and I’ve been one of them over the years – hold their heads in exasperated horror.
"Worse, it’s made some of us genuinely fear for what may come next. To be blunt: I don’t want to wake up to news even worse than your horror smash."
Watch: Katie Price buys pink Ferrari she can't drive
His article concluded: "You may be outraged by this open letter and tell me to shove my concern where the sun doesn’t shine.
"But whether you want to hear it or not, someone has to tell you some home truths before it’s too late. Wake up, Katie. Don’t do it for me — do it for your children."
Morgan is preparing to launch his return to TV later this month when he hosts Piers Morgan Uncensored on TalkTV — Sun owner Rupert Murdoch's new channel.
Price, meanwhile, recently starred in BBC documentary Katie Price: What Harvey Did Next.
Watch: Katie Price charged with harassing ex's partner