'TMZ Hollywood Sports' -- Jermaine Jackson Calls BS on Mayweather ... Prince Ain't On the Money Team

Michael Jackson's son Prince is NOT on The Money Team ...despite what Floyd Mayweather believes ... at least that's what Jermaine Jackson told us yesterday.

Jermaine says there's a perfectly good explanation for why Prince Jackson was rolling around in a TMT truck -- but it has NOTHING to do with the fact he supports the boxer.

Check out the clip -- you buyin' what Jermaine is sellin'?

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