CRAZED Britney Spears tried to HANG herself with a bedsheet before pleading with her estranged husband to give her another baby, we can reveal.
In a week of rehab madness the bonkers beauty wrote the number of the beast, 666, on her shaved head before running round the clinic screaming "I am the Antichrist!" at frightened staff.
"Later that night she tried to kill herself," a friend told us. "She attached a sheet to a light and tied it around her neck. Paramedics were called, but luckily she was unhurt."
But within days out-of-control Britney had swung from SUICIDAL to MATRIMONIAL as she told hubby Kevin Federline she wanted to take him back, renew their wedding vows and get PREGNANT.
The unpredictable 25-year-old star is now planning a new life for them and their two children in Louisiana as she sees out her stay at the Promises Clinic in Malibu, California.
A source close to the clinic said: "Britney has realised what a rock Kevin has been to her, and how out of control she has acted recently.
"She has been talking to Kevin every night for hours on the phone, telling him she still loves him.
"She just wants to be with him again, and thinks having another baby will seal their marriage.
"Britney seems much happier and has calmed down a lot. She's a completely different Britney from the beginning of the week."
Staff at the addiction clinic will be relieved.
They have struggled to cope with the unhinged beauty who has checked in and out of rehab like a yo-yo, deranged by the torment of her break-up with Kevin last year.
Her pal told us: "She is still very vulnerable. Last Saturday she said she had the number 666 written onto her bald head. She was crying, and shouting, ‘I am the Antichrist!'
"The clinic people just didn't know what to do. Then she started screaming, ‘I'm a fake! I'm a fake!' It must have been really frightening.
"When she tried to hang herself it was more a cry for help."
And Kevin has responded to it. We exclusively revealed last week that he visited her in the clinic and promised to stand by her if she cleaned up her act and got well.
Since then the father of her two children, Sean Preston, one, and Jayden James, five months, has been a regular visitor.
A source close to Britney said: "Kevin has been a real tower of strength for her and she has finally decided to give their marriage another shot.
"She thought things were over between her and Kevin after his wild partying and gambling.
"She felt he had deserted her and left her to bring up their two children on her own.
"She never even dreamed she would take him back.
"But Kevin's like a different man now. He's never been so caring before, and is really worried about Britney.
"He's been Britney's rock during her difficult time, and she wants to give him another chance.
"This week she even asked if she could have a night away from the Promises Clinic with Kevin. She's still waiting to hear if they will give her a pass so that they can go out for a romantic meal together.
"Kevin has also taken their two little boys to see their mum in rehab."
Just weeks ago the couple were bitterly fighting for custody of the two children.
Britney was pictured crazily attacking a car with an umbrella when Kevin refused to open the door and let her into his house.
At one stage Britney offered Kevin £100,000 to drop a custody hearing over their two sons.
He refused the money but said he would postpone the court appearance until Britney had got herself sorted out.
Now sources say the couple have put their differences behind them and plan to renew their marriage vows as soon as Britney gets out of rehab. But while her love life is looking up, her health troubles are far from over.
It has been alleged the former pop princess's erratic behaviour has been caused by Class A drug crystal methamphetamine.
Crystal meth — which can be either snorted or injected — affects the brain and nervous system, triggering side effects like agitation, paranoia, confusion and violence.
Britney has struggled with drugs before and sources close to the rehab clinic have said she is attending sessions designed to address drug and booze problems.
Pals have claimed that they have seen her taking cocaine and ecstasy in the past.
But her behaviour has spiralled completely out of control since the beginning of the year.
She has repeatedly been photographed knickerless on wild nights out. She checked into a rehab centre in the Caribbean two weeks ago, but left after just 24 hours.
Then she went to a hair salon in California and shaved off her trademark locks.
A week ago she threatened to kill herself by gulping down two family-size bottles of painkillers.
A pal told us: "Britney held up two bottles of Tylenol (an American painkiller) and shouted, ‘I'm gonna do this, this is it! I'm through with the whole f***ing circus'."
A female friend was there and managed to talk her out of it.
"Britney was terrified Kevin would get full custody of the children after her public breakdown. She kept crying and said she would kill herself if she lost her boys," said her pal.
"She's relieved to see the end of the custody battle. Now we're all hoping that she can get her life back together."