Britney Spears' two ex-husbands, Kevin Federline and spouse of 55 hours, Jason Alexander, have entered the fray.

But while K-Fed has offered support, Alexander's claims could send the singer into a further tail spin.

First up, K-Fed paid a surprise visit to Britney in Promises rehab center last Friday (February 23), then again on Saturday (Feb 24) with her sons Jayden James and Sean Preston, and has vowed to stand by her.

According to explosive News Of The World reports, the wannabe rapper wants to give their marriage another go.

He allegedly told the singer: "I'll stand by you if you clean up your act. I just want you to get well."

A pal close to K-Fed added, "Just a few days ago there was no love lost between the two of them but it's taken Britney's breakdown to make Kevin realise that he still loves her.

"He's been having second thoughts about the split and thinks there may be hope of a reunion after she gets better."

News of K-Fed's unexpected support comes as more details of Britney's harrowing week in the lead-up to her stay in rehab, emerge.

Over the past week, friends say the singer threatend to commit suicide; was strip searched in rehab amid fears she was concealing Class A drugs on her person; offered K-Fed 100, 000 to drop a custody hearing and was found in possession of a "death list" of people she wants to die (including K-Fed).

Meanwhile, Brit's first husband Jason Alexander, has revealed his fears over the singer's alleged drug-taking, saying he's worried she will go the same way as model Anna Nicole Smith.

Alexander told the Sunday Mirror, "We used to take ecstasy at night to party and cocaine during the day to stay awake. Then we would take downers like Valium and Vicodin to come down and rest... I couldn't keep up with her."

He also revealed that one New Year's Eve, Britney had a near death experience after gulping back MDMA capsules, saying "I thought, 'This b*tch is going to f**king die right here in front of me'." He also told the tab the couple were high on the night they got hitched.

It what will come as more of a blow to the (hopefully) recovering star, he also shed light on their experimental sex life, revealing he felt as if he'd "won the sex lotto" on one occassion when Britney cavorted with another girl in front of him then invited him to join in.

But as more and more shocking stories about the poorly pop star continue to swarm, aides are hopeful Britney will stay the full 30 days in rehab this time.

One friend even revealed Brit has a bed reserved in University of California Hospital's psychiatric facility should she need extra support.

"She'll get much more robust help at UCLA, that's why (her family) have asked if she can stay there for a while," said the mate.

Let's hope this is the beginning of Britney's road to recovery...

Check out Britney in her hair, sorry, heyday here.

'SLJ'