'Idol' Finalists Move In to Bev Hills MEGA-MANSION

The top 13 finalists on "American Idol" have just moved in to a MASSIVE Beverly Hills mansion together ... a mansion that costs roughly $100,000 per month to rent.

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The estate -- worth an estimated $12 million -- boasts 9 bedrooms, 9 bathrooms, a hot tub, pool, koi pond, game room with a pool table and one of the SICKEST VIEWS EVER.  We're told on a clear day, you can see the ocean from the house.

The wannabes moved in on Friday ... and they'll stay there until they're voted off the show.