Mariah Carey, 42, showed off her busty and toned body in a bright red bikini while on tour in Australia last week. The singer took to Instagram to share the photo of herself in the two-piece swimsuit and a very short denim skirt.

Carey, her husband Nick Cannon, and their children are traveling down under together after spending Christmas in Aspen, Colorado.

After giving birth to twins Monroe and Moroccan nearly two years ago, the pop star lost a staggering 70 pounds. We don't blame her for showing off some skin!

The singer is one of the new judges on the new season of "American Idol," alongside Nicki Minaj, Keith Urban and Randy Jackson. The new season kicks off Jan. 16 and 17.

Slideshow: Mariah!