Christina Aguilera posts TOPLESS snap of her breasts being cupped by fiancé Matthew Rutler

She modeled a kinky metallic mask, while her sizzling heartthrob - who met her when he was a production assistant on Burlesque - was in a suit. The duo have been engaged since 2014.

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Christina Aguilera, 40, fires up Instagram with topless photos

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Christina Aguilera, 40, fires up Instagram with topless photos