Mariah Carey Bikini: Singer Flaunts Weight Loss On The Beach In Australia (PHOTO, VIDEO)

Mariah Carey spent her last days in Australia soaking up some sun in a skimpy bikini before heading back to the U.S. for the premiere of "American Idol."

Carey donned a red bikini, and flaunted her 70-pound weight loss while on the beach in Melbourne, according to PopSugar. The superstar singer has been in Australia since New Year's, when she partied alongside husband Nick Cannon and then performed two shows Down Under.

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Carey, who credits her post-pregnancy weight loss to the Jenny Craig program, showed off a tiny waist and flat stomach not even two years after giving birth to her twins.

I used to be able to slim down just by exercising more, but that’s changed. Since having the babies, I realize that 90 percent of losing weight is my diet,” the 42-year-old told Shape in April. She dropped the pounds after "ballooning" during her pregnancy. "I put on around 70 pounds, but if you look at photos of me when I was pregnant, you'd say, 'Wow, she gained 9,000 pounds!'"

Carey wrapped up her Australian mini-tour on Jan. 5, according to the Herald Sun, and will be heading to the judges table when "American Idol" goes live for Season 12.

The relaxation will surely pay off when Carey faces fellow judge Nicki Minaj once again. The mother of two revealed that she felt "unsafe" while on set with the rapper, who made physical threats against her during the first round of auditions.

"It felt like an unsafe work environment," Carey told Barbara Walters. "Anytime anybody's reeling threats at somebody, it's not appropriate. I've got two babies, I'm not gonna take any chances. So, yeah, I did hire more security."

Season 12 of "American Idol" premieres Wednesday, Jan. 16, on Fox.

PHOTO: Mariah Carey poses in a bikini on the beach in Australia.