On Saturday night, the diva was spotted arriving at the Dorchester Hotel to perform at a wedding.
Making sure all eyes were firmly fixed her way, she opted for a gaping black lace dress that exposed her ample, eye-popping cleavage.
She was joined by toyboy lover Bryan Tanaka who looked like the cat that got the cream as they were photographed heading into the venue.
While earlier in the evening, the star was dressed to impress in a floor-skimming glitzy silver frock which she wore under a thick and fluffy white coat.
Giving her more height, Mariah wore the glamorous look with chunky silver platforms.