Christina Aguilera 20 lbs weight loss revealed on The Voice finale

Christina Aguilera showed off her thin frame in a tight skirt and cropped top for her spirited performance of Feel This Moment with rapper Pitbull during The Voice Season 4 finale on Tuesday night in Los Angeles.

Christina Aguilera, 32, looked incredible in a skintight bandage black skirt and a sparkly silver top that revealed her hot pink bra underneath.

The singer added a boost of height to her 5ft 2in frame with sky high black peep-toe heels and accessorized with giant diamond earrings.

Christina Aguilera wore her platinum blonde hair in glamorous curls over her one shoulder and opted for a smokey eye and nude lips.

She made quite a grand entrance: Pitbull stood onstage and started his rap, until Christina Aguilera appeared on a raised platform to hysterical screams from the crowd.

The set turned into a disco scene with multi-colored lights and a lit-up stage.

Christina Aguilera appeared to hit a few flat notes and the star was seen touching her earpiece periodically.

The pair’s lively performance ended with colorful confetti and ribbons raining down onto the stage.

Christina Aguilera’s super-slim appearance was a far cry from what she looked like back in November at the American Music Awards in Los Angeles.

Sources told Us Weekly that critics motivated her to lose more than 20 lbs in weight.

“A lot of people were on her about her weight and it depressed her,” a friend said.

“She went through a bad time because of the criticism.”

Christina Aguilera reportedly signed up for the 1,600-calorie-a-day Fresh Diet program, which offers users a variety of nutritious food options.

“She did it all on her own,” said the source.

“She goes online and picks out her food.”

Christina Aguilera was always a slender entertainer but after her 2010 divorce from Jordan Bratman she apparently gained 40 lbs by gorging on pizza and living a life of excess.

The singer was also seen enjoying the nightlife with boyfriend Matthew Rutler – her steady man since late 2010 – which no doubt put pounds on her tiny frame.

Prior to her weight loss, in an interview with Lucky magazine, Christina Aguilera said she was totally unrepentant about the way her clothes advertise her assets.

“Actually, the challenge I’ve always had is being too thin, so I love that now I have a booty, and obviously I love showing my cleavage,” she told the magazine.

“Hey, if you can work it and you can own it, that confidence is going to shine through.”

Meanwhile, country singer Danielle Bradbery, 16, was crowned the Season 4 winner of The Voice on Tuesday night.

Michelle Chamuel, 26, finished second and the Swon Brothers, Colton, 24, and Zach, 27 came third.

Danielle Bradberry’s victory marks the third triumph in four seasons for one of judge Blake Shelton’s proteges.