'90210' Star Trevor Donovan -- Hillary Clinton's Athletic Supporter (TMZ TV)

Trevor Donovan Hillary's Athletic Supporter [TMZ TV]

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When Hillary Clinton finally makes her White House run official ... we might see a lot more of ex "90210” star Trevor Donovan -- who's become a major Clinton insider.

So if she wins he could assume a position. A shirtless one would be best ... for morale and all.

Jason Momoa -- Banging to Stay in Shape :: tmz-on-tv-3