New York's king of real estate joined forces with rap music royalty this weekend for a great cause. Donald Trump and his beautiful wife, Melania, hosted a party at Trump's Mar-a-Lago estate to celebrate Sean "P. Diddy" Combs' philanthropic efforts and to raise hundreds of thousands of dollars for hip-hop honcho Russell Simmons' Arts Foundation for disadvantaged kids.

"Now we're gonna show you how we party," P. Diddy insisted. "When we do things like this, it just breaks down the stereotypes that the best of both worlds can't come together."

The party was held in Trump's brand new $35 million ballroom -- the same room in which he celebrated his marriage to Melania just seven weeks ago.

Trump told us that Simmons and his wife, Kimora Lee, fell in love with the room at his wedding. "I think sitting at my wedding, looking at the ballroom, he said, 'This is where we're going to have our event,'" Trump recalled.

Trump's butler, Tony Senecal, showed "Extra" around, pointing out the pricey crystal chandeliers. "They're about $250,000 a piece and there are 16 or 17 of them in here," he revealed. "This is not our usual furniture here at Mar-a-Lago, but for one evening, I think it's really nice."

What a night for the kings of bling and their brides to raise the roof and raise money for a special cause.