Brtiney at Promises Rehab in Malibu

"Extra" has confirmed that pop princess Britney Spears checked into rehab late Tuesday morning at the urging of her concerned family and friends.

Britney is seeking help at Malibu’s exclusive treatment facility, Promises.

“Extra” recently got an exclusive tour of Promises, where patients share a room during their average 45-day stay.

Promises founder Richard Rogg told us that patients are at a very low point when they seek help.

“You have to hit a mental, spiritual, emotional kind of bottom,” Rogg said. “It’s that place where you are too afraid to go on living and too afraid to die.”

This breaking news comes just days after Britney shaved her head, and on Monday, “Extra” discovered new clues that may explain why Brit gave herself a buzz cut.

According to a stunning new report in OK magazine, Kevin Federline was at the pop star’s Malibu mansion on Friday when she arrived home from rehab, and a blowout between the exes broke out.

“They had a huge argument,” revealed OK’s Rob Shuter. “Kevin threatened Britney that he was going to have people test her hair to find out exactly what she’s been up to. She was so scared. That was what made her have her head shaved.”

We have also learned where Britney fled to Friday night after daring to go bald; she reportedly showed up at L.A.’s chic Mondrian Hotel in an electric blue wig.

Sources revealed that Brit was seen shaving her legs at the pool and crying after she was refused a room.

“She didn't have any credit cards, she didn't have any cash… I don’t even believe she had any I.D.,” dished US Weekly’s Katrina Szish.

Szish added that Brit’s bizarre behavior was noted by the staffers who dished, “she was depressed and confused.”

“The general consensus is we’re seeing Britney have a breakdown before our very eyes,” Szish told us.

After Britney’s sudden downward spiral, her friend JC Chasez expressed his concern from across the Atlantic.

“I feel bad for her,” JC said to MTV U.K. “I’ve known her since she was 12 years old; she’s one of the sweetest people you've ever met."

Chavez also pointed out, “A divorce at age 25 is never going to be easy; the one person she trusted more than anybody in the world is not with her anymore.”