Christina Aguilera performs at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. Credit: Ethan Miller/Getty

It's an Xtina Renaissance! Christina Aguilera took the stage at the Billboard Music Awards in Las Vegas on Sunday, May 19 -- and proved that her much-ogled, slimmed-down body is no Photoshop trick. Crooning "Feel This Moment" with Pitbull, the 32-year-old singer and mom showcased, once again, her slimmed, toned figure in a short black skirt and black top. She accentuated her v. 2013 look with an understated makeup look.

The superstar has been slowly revealing her slimmed-down over the past several months: Last week via Twitter and Facebook, she posed in in a bra top and black pencil skirt, checking out an ocean view from her balcony. She also made comment-causing appearances at the Time 100 Gala and a March Voice event.

The singer will return to as a coach for Season 5 of the NBC music competition this fall alongside fellow returning coach Cee Lo.

"I love my body. My boyfriend [Matthew Rutler] loves my body," she said back in 2012 of her fluctuating weight. "My son [Max] is healthy and happy, so that's all that matters to me."