It's official:  BRITNEY SPEARS is single again.  Her fiancé Jason Trawick even removed himself as Britney's co-conservator, which means that Britney's dad Jamie Spears is in total control once again.

--Jason started out as Britney's agent.  They got engaged last year, after which he became her co-conservator.  Now he's none of those things.  Britney has new management.

--But sources say the breakup was amicable, and the two of them just grew apart.  Britney released a statement saying, quote, "Jason and I have decided to call off our engagement.  I'll always adore him and we will remain great friends."

--Jason reportedly signed a confidentiality agreement, meaning he can't talk about the relationship.

--One source claims the breakup was over kids.  Britney wanted more, Jason wanted NONE.  She's 31 . . . he's 41.  Britney has already given Jason back the $90,000 engagement ring.