Boiling Britney Spears isn't the only one up in arms over ex-hubby Kevin Federline 's upcoming tell-all — now another of her exes, Sam Asghari , is getting into the ax-grinding act, RadarOnline.com can reveal.

"It would be the first book that'll tell you how to be a professional father," Asghari, 31, said in a televised interview – implying Federline can boast about his parenting skills only because he was paid so handsomely from the divorce settlement.

Spears, 43, and Federline, 47, share sons Sean Preston , 19, and Jayden Spears , 18, but the former backup dancer has had majority custody of the boys since October 2007. Article continues below advertisement

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