Christina Aguilera voice is not so much a topic of conversation these days as is her fluctuating weight. Ever since the 31-year-old took to the stage at a Michael Jackson Tribute Concert in October, she has been headline fodder for her noticeable weight gain.

Yet, on the most recent episode of NBC's The Voice, Christina Aguilera showed off a slimmer figure and a more polished look.

On Monday's episode of The Voice, Aguilera's stunning curves, slender face and beautiful ensemble stole the show.

Fans took to Twitter to compliment the mother-of-one on her new look. We've gotten used to her weight gain. Clearly. Because Christina Aguilera's looking kinda hot again, tweeted Complex Girls. Did Christina Aguilera get a new make-up artist? She looks great, tweeted journalist Lisa Ling. Christina Aguilera lost so much weight it's unbelievable! Even though she's stunning no matter her weight, wrote Twitter user @_unsynchronized.  FINALLY Christina Aguilera lost some weight and got rid of the hair extensions! Makes watching The Voice a lot more enjoyable! posted user Constantine. 

Christina Aguilera's weight gain brought the singer a heap of flack over the past few months, as critics made sure to point out how different the pop star looked compared to her Genie in a Bottle days.

Aguilera did not pay attention to the jabs.

When asked about her weight gain in January, the singer responded, As long as I'm happy in my own skin, that's all I need, that's all the confirmation I need. I'm happy where I am, I have a boyfriend that loves my body, I love my body, my son is healthy and happy. That's all that matters.

She first came onto the music scene in 1999 as a powerhouse vocalist contending against other pop starlets like Britney Spears and Jessica Simpson. At the time, she was exceptionally slender. Some questioned whether or not she had an eating disorder.

The tables then turned and Christina Aguilera faced criticism from the other end. Kelly Osbourne slammed Aguilera's fuller figure, stating that the singer had previously criticized Osbourne's physique.

[Christina] called me fat for so many f---ing years, the reality-star said of the fellow 5-foot 2-inch celebrity. F--- you, you're fat, too, she said during E!'s Fashion Police show. Maybe she is just becoming the fat b---h she was born to be. posed the question Is this what you really want in a woman? to its readers, in regard to Aguilera's visible weight gain in October.

The greatest tribute concert to Michael Jackson turned into a gossip-mongers' ball when photos of Christina Aguilera's buxom physique surfaced, wrote AskMen. Likely bringing smiles to the faces of by those she's purported to have called fat in the past (like the currently trim Kelly Osbourne), the shift in Xtina's weight could be a serious issue men in relationships face with their partners.

Another point of contention has been The Voice judge's outfit choices.

Just one month ago, the singer sporting a low-plunging necklace that revealed inches of décolletage paired with poufy poodle hair and an add disc-shaped hat.   

Host Carson Daly quipped at the quirky accessory, a headband designed by Sonia Rykiel, on his blog. Another thing I want to mention that America will be thrilled about in the battle rounds is... new wardrobe for all the coaches! What Purrfect the Cat was for conversation during the blind auditions, Christina Aguilera's compact-disc hat will be for the battle rounds, Daly said, reported by Us Weekly.

But on Monday's show, Aguilera looked sexy and sophisticated in a curve-hugging, zebra-printed Alexander McQueen dress paired with smoky eye makeup, glossy red lips and soft ringlet curls.

What do you think of Christina Aguilera's more pulled together look?