Protective Justin Timberlake is showing his support for Britney Spears as the fragile pop tart gets skewered by her ex Kevin Federline , RadarOnline.com can reveal.

The former boy bander, 44, is said to think it's "despicable" that his onetime girlfriend, 43, has come under attack in a scathing memoir that paints her as a deadbeat mom in major need of being saved from herself.

Federline, 47, is currently hawking his damaging tell-all, You Thought You Knew , which goes into graphic detail about his failed three-year marriage to the Toxic trainwreck. Article continues below advertisement

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In addition to accusing her o

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