Bruno Mars will bring the Uptown Funk to the ritzy shores of Cape Cod this weekend -- and he's gonna make serious bank for doing it ... at the wedding of a powerful CEO's son.

Sources with direct knowledge tell us Bruno's been hired to perform at the wedding of Troy Brown and Kristin Ryan, and while those names might not ring any bells ... Troy's dad's does.

Motorola Solutions Inc. CEO Greg Brown, aka father of the bridegroom, booked Mr. "24K Magic" for the event going down at a super swanky hotel in the area, and spared no expense. We're told the wedding tab is in the millions.

Bruno, of course, will get a handsome slice of that ... we're told his performance price tag will hover somewhere between the high six-figure to seven-figure range.

As for the wedding guest list, it's unclear how many will attend, but the bride and groom are only allowing those who've been vaccinated to witness their "I Do's" ... and put their pinky fingers to the moon.

So if any possible guests had reservations about getting a COVID jab ... maybe a free Bruno concert convinced them to suck it up and take one for the team.