Britney Spears’ ex-husband Kevin Federline is sounding the alarm.

In his new memoir, “You Thought You Knew,” Federline writes that he has become increasingly concerned about what he regards as Spears’ erratic behavior.

“The truth is, this situation with Britney feels like it’s racing toward something irreversible,” he writes. “It’s become impossible to pretend everything’s OK. From where I sit, the clock is ticking, and we’re getting close to the 11th hour. Something bad is going to happen if things don’t change, and my biggest fear is that our sons will be left holding the pieces.”

Federline told the New York Times that he hasn’t spoken to Spears in years but has generally learned about her behavior through their two sons, Sean Preston, 20, and Jayden James, 19.

“I’ve never, ever, o

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