The singer shows off her toned tummy at a party thrown by another famous blonde in Los Angeles. Plus: More AMAs action, Matt McConaughey and more

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CROWD PLEASER

Mary J. Blige brings down the house during her performance of "We Ride (I See the Future)" at the AMAs. The singer also scored two trophies, including favorite soul/R&B album for her multiplatinum-selling The Breakthrough.