Lakers Owner Jeanie Buss

Jeanie Buss is usually rocking power suits in business meetings, but over the weekend -- she was decked out in all white on the beach ... this after getting married, TMZ has learned.

Sources with direct knowledge tell us the Lakers owner got hitched to comedian Jay Mohr Sunday during a small, intimate ceremony in Malibu -- where about 20 close friends and family members in attendance ... and the bride and groom looking happy as can be.

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As you can see in this photo, Jay was over the moon when Jeanie said "I do" ... sweeping her off her feet and holding his bride up with a gorgeous backdrop behind them. BTW, our sources say there weren't any famous people in attendance ... meaning no…