'The Voice' First Live Performance: Christina Aguilera Shows Off Weight Loss During 'How I Feel' [PHOTO] [VIDEO]

“The Voice” had its first live show Monday night and kicked it off with a hot performance by Christina Aguilera. The singer, who is a judge on the hit talent competition, showed off her impressive weight loss in a sheer body suit and black tuxedo jacket.

She later took the jacket off, revealing a black bra and shorts.

Performing “How I Feel” alongside rapper Flo Rida, the 32-year-old amped up the audience before nine of the the twenty remaining singers went head-to-head with their own live performance. She later slipped into a white Versace cocktail dress.

Aguilera has reportedly lost 49 pounds after gaining weight following her divorce from Jordan Bratman in October 2010. She is sexier than ever, and lost the weight just in time for her fifth season as a judge. Aguilera is “as happy as can be, as fit as can be and as full of life as can be," Mark Burnett, producer of the talent competition, told Life & Style in September. "She looks amazing.”

While she has been working with a personal trainer, the Life & Style article reported that she now adheres to a strict diet, which includes limiting her alcohol intake. Aguilera starts her day with healthy fats and protein such as an avocado, blueberries and turkey bacon. For lunch, she eats chicken breast and a salad filled with bacon. (Chicken breasts are widely viewed as a great source of lean, low-fat protein.) And instead of picking up unhealthy snacks, the singer relies on shrimp cocktails and celery with almond butter.

Watch Aguilera's performance below: