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.

Christina Aguilera and Fiancé Matthew Rutler Make Rare Red Carpet

Christina Aguilera, 40, fires up Instagram with topless photos

Christina Aguilera 'hated being super skinny' in early fame as

Christina Aguilera, 40, fires up Instagram with topless photos

Christina Aguilera's Fiancé Matthew Rutler Grabs Her Bare Chest

Christina Aguilera's Gorgeous & Curvy Bikini Photos Are All About

Christina Aguilera poses topless while fiancé covers her chest

Christina Aguilera poses topless, recreates 'Stripped' album cover