Christina Aguilera lost a whole ton of weight and she's now flaunting it.

The singer headed to LAX airport with her boyfriend Matt Rutler on June 22 wearing jeans, flip-flops, a fedora hat, and T-shirt that read "Life fast cause it won't last." See a photo here.

In regards to her weight loss, a source told Us Weekly in June, "It's more of a mind-body thing for her. She believes in exercise that she enjoys, doing strength work as opposed to intense cardio."

In March, a source also told People that Aguilera has begun eating healthier and working out on a regular basis. The singer has been training with Tee Sorge, who also helped her shed some pounds for her 2010 role in Burlesque.

The 32-year-old also showed off her slimmer figure when she performed at the Billboard Music Awards in May. The singer wore a black dress as she hit the stage with Pitbull for their song Feel This Moment. See photos here.

A few days before the award show, the singer even posted a photo of her thinner self on Twitter looking stunning in a black bra and skirt on June 15. She captioned the image, "On set shooting music video with @Alexoficial for #HoyTengoGanasDeTi."

Aguilera reportedly lost approximately 20 pounds because of critics, according to sources.

The singer, whose career began 15 years ago, has often been criticized for her weight fluctuation. Still, it's hard to determine for sure whether or not critics are really the catalyst behind her weight loss.

"I've been through my highs; I've been through my lows. Being too thin, being bigger. I've been criticized for being on both sides of the scale. It's a noise I block out. I love my body. My boyfriend loves my body. My son is healthy and happy, so that's all that matters to me," she told Marie Claire in January 2012.

She also told People in October 2012, "I embrace my body, and I embrace everything about myself."

See a video of Aguilera performing at The Voice in November 2012 before her weight loss.

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Christina Aguilera