Carey turned heads in a bright red, lace-up bodysuit, which she styled with high-waisted distressed skinny jeans and black leather boots. Her matching red belt and leather jacket gave the sexy ensemble an edgy spin, while accentuating her slim waist.
Tanaka, clad in olive green pants and beige kicks, complemented his girlfriend by sporting a red T-shirt and varsity leather bomber jacket.
A source told ET earlier this month that the blond beauty has been staying fit and fabulous by simply eating healthy -- she doesn't go to the gym or feel bad about enjoying a glass of wine from time to time.
"She is very confident about her appearance now," the source explained. "The change to her diet was an adjustment at first for her, but she's doing really well keeping up with it. She's in a very good place with her health and her life."
Hear more on the pop star's transformation in the video below!