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Shelly Sterling dialed 911 the second she found out Donald Sterling was home alone with V. Stiviano -- and told the operator a woman she described as "African black" had broken into her house. dialed 911 the second she found outwas home alone with-- and told the operator a woman she described as "African black" had broken into her house.

On the October 1 call -- obtained by TMZ -- Shelly says her gardener saw V. going in a side door of the Sterling mansion ... and she was in a bedroom with Donald.

By the way, Shelly was in France while this was all going down, but repeatedly tells the operator ... V. is "tormenting" Donald.