Dr. Dre FELL IN LOVE with Tom Brady‘s mega-mansion in L.A. — and put an offer to buy the house almost immediately after it hit the market back in March … TMZ Sports has learned.

We broke the story … Tom and Gisele listed the 18,700 sq. ft. Brentwood estate they custom built from the ground up for $50 MILLION after barely spending any time living in the place.

We’re told there were “multiple interested parties ready to put offers on the house” … but Dre swooped in with a solid offer first … and T&G decided to sell to the Doc.

Sources tell us the deal has not yet closed — but it’s close.

Tom and Gisele were offering the house fully furnished … but sources tell us Dre has his own stuff he wants to put in the house — and has chosen to pass on all of the stuff the Bradys spent years collecting from various trips around the world.

As for Dre’s finances, he was recently listed in Forbes richest hip hop stars with an approximate net worth of $550 MILLION.