The Bₛ --> mu+mu- and Bd --> mu+mu- Decays: Standard Model and Beyond

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I review the status of the rare decays Bₛ --> mu+mu- and Bd --> mu+mu-. The latest Standard Model predictions for the corresponding branching ratios are discussed. An overview of additional observables that are accessible in the Bₛ --> mu+mu- decay is given. The new physics implications of the recent measurement of the Bₛ --> mu+mu- branching ratio are discussed both model independently and in the context of the Minimal Supersymmetric Standard Model.