In a medium mixing bowl, whisk together mayonnaise through Old Bay seasoning. Gently toss crab into mixture with a fork, making sure that you don't break up the large pieces of crab.
Pull the edges of the split lobster shells apart and gently lift the tail meat to rest above the shells. Place the prepared lobster tails on a baking sheet.
Brush tops with melted butter. Evenly divide and gently press crab imperial mixture into the tops so it doesn't fall off.
Bake for 10-12 minutes or until lobster tails are opaque and crab imperial is browned. Serve with lemon wedges.
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