Floyd Mayweather"s Birthday Cake Cost $3,000 ... Came With Crystals (Pics)

Floyd Mayweather even balls out on CAKE … ‘cause his birthday dessert was covered in crystals and cost $ 3,000 … TMZ Sports has learned.  We spoke with the maestro behind the insane dessert, Bree Miller — who says she spent 72 hours on the…

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