NEW PIC: Christina Aguilera Debuts Slimmer Bod in Tight Black Dress

Christina Aguilera in Los Angeles, CA on April 12, 2012. Credit: FameFlynet

Christina Aguilera has turned over a new leaf, and underneath it has come more covered-up wardrobe choices.

On Thursday in Los Angeles, the Voice coach, 31, showed off her slimmed-down figure in a casual but form-fitting long-sleeved dress, black tights and leopard-print Christian Louboutin heels.

It's no secret that the singer has done a 180 with her style recently. After filming The Voice auditions in a saucy black, cleavage-baring mini, Aguilera has switched up her wardrobe for the recent live performances, sporting more modest dresses and softer hair and makeup.

"I've been through my highs, I've been through my lows; I've been through the gamut of all things in this business," Aguilera shared about her look with Marie Claire magazine in February. "Being too thin. Being bigger...It's noise I block out automatically. I love my body. My boyfriend loooooves my body. My son is healthy and happy, so that's all that matters to me."