The wannabe rapper split from Spears in 2006 after two years of marriage and Federline was handed custody of their two young sons, Sean Preston and Jayden James, in 2007 following a bitter court battle.
The former couple is now on friendly terms and share custody of the boys.
But Federline has been pouring out his emotions in tracks for his second record - the follow-up to 2006 flop Playing With Fire.
Collaborator Krayzie Bone, from hip-hop group Bone Thugs-N-Harmony, insists fans will be impressed with Federline's efforts when the album eventually hits stores - just like he was when he listened to the lyrics.
He tells HipHopDX.com, "People gon' say I'm crazy, but to my surprise the stuff that he let me hear, it was pretty decent. He told me that he didn't get a chance to really put out the music he wanted to (with his first album), and he made mistakes in putting out the music that he did - by putting out the club stuff.
"I really didn't hear none of his old music, but the stuff that he let me hear was, like, really deep. He was talking about his life. He was actually telling his side of the story (of the split with Spears) in a more mature, adult kind of way. Opposed to just being on the record saying, 'F**k Britney.'
"He definitely got a story to tell (sic) - where he came from, and where he ended up."
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