Kevin O’Leary warns celebrities to ‘shut your mouth and just entertain’ after Billie Eilish Grammys speech

"Shark Tank" investor Kevin O'Leary issued a stark warning to celebrities after Billie Eilish turned her Grammy Awards speech into a political soapbox, telling Fox News that lecturing fans from the stage is a losing business move.

"Half the people in politics that you piss off won't buy your music anymore," the O'Leary Ventures chairman told "America Reports" on Tuesday.

"Don't be stupid about it, but hey, they don't listen."

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