Christina Aguilera has dropped some major weight and flaunted her new, tighter figure on NBC's "The Voice" finale on Tuesday.

She sang the power-packed, "Feel This Moment" with Pitbull, wearing a shiny silver sheer top with a revealing pink bra and curve hugging black skirt. But her dramatic 30-pound weight loss caught everyone's attention, according to Hollywood Life.

It looked as if she had undergone a total body transformation, which she looked to flaunt onstage.

Dr. Shawn Garber, weight loss expert and director of the New York Batriatic group, said to HL that tremendous weight loss like Aguilera's requires "holistic health and a commitment to wellness involving avid calorie counting, avoiding carbohydrates and daily exercise."

In his professional opinion, it takes a lot of determination and endurance to achieve a major body size reduction.

"When weight loss is your top priority, dieting and exercise are essential," he explained. "Successful weight loss is about the equation, 'calories in and calories out,' meaning that you want to burn more calories than you consume daily in order to lose weight."

Consumption of food depends on your metabolism, body type, age, and how much physical exercise you have a day.

Not too long ago, Aguilera had taken to Twitter to post a sexy selfie of her in a tight black bra top and matching skirt in an effort to show the world that she had been hitting the gym during her seasonal absence from the popular music competition.

She posed with her bleach blonde hair and sky scraping heels, and also donned a similar tight get-up on the show.

For a clip, look below!