If there's one person who's still not convinced that Britney Spears is ready to put her life back on track, it would be her soon to be ex-hubby Kevin Federline.
A source close to the failed rapper revealed that K-Fed believes that Britney is 'mentally unstable', and the reason behind her breakdown earlier this year was because of the pressure juggling fame and family.
"He thinks she's mentally unstable and too young to be a mom," Us Weekly quoted the source, as saying.
The source also reveals that Federline expects to get "full custody" of his and Britney's sons - Sean Preston and Jayden James - 'one day'.
And, for his kids' sake, the insider reveals that K-Fed will be keeping a close eye on his estranged wife.
"He loves his kids and, to that extent, he will look after Britney," the source said.
After the 'Toxic' singer began her free-fall in the early months of this year, with boozy nights and pantyless partying and shaving her head, K-Fed was the one to step in demand that she enter rehab.
He also threatened to take away the kids if she didn't get professional help. Faced with that threat, the singer entered Promises, a rehab clinic in Malibu and completed their month-long programme.
Soon after she came out of the centre, the two settled on a custody agreement of their kids. Britney and Federline share custody, but they stay with their mother. The couple are currently working out their divorce.