Britney Spears shades ex Kevin Federline’s failed rap career: ‘Bless his heart’

Britney Spears shades her ex-husband Kevin Federline’s failed attempt at making it as a rapper in her forthcoming memoir, “The Woman in Me.”

The “Toxic” singer savagely writes, “Bless his heart” while reflecting on K-Fed taking his short-lived rap career “so seriously,” Us Weekly reported Friday.

Spears, 41, also touches on the public “doubting” Federline’s musical talents during their marriage, according to the magazine.

Federline, 45, notoriously debuted his first song, “Y’all Ain’t Ready,” in 2005 followed by the critically panned “Popozão.”

He then dropped his first — and only — album, “Playing with Fire,” in 2006.

A Rolling Stone reviewer wrote that “Federline’s rhyme flow is the opposite of tight,” while a Slant Magazine critic opined that the album was “just as disposable and dumb as you’d expect.”

Meanwhile, a Billboard writer jabbed, “In general, Federline enunciates well.”

Federline’s music career was a far leap from Spears’ own success as a chart-topping pop superstar.