The Modern Family star, 19, recently returned from a holiday abroad and wanted to let her followers know she was back home in California.
And to make sure she got her message across loud and clear, the actress decided to share a shot of her bare rear as she posed in a tiny white thong leotard and high heels.
The seductive photo sees her posing with her profile facing camera and her shapely derriere on full display.
Ariel had just returned from China with her 29-year-old boyfriend Levi Meaden.
The star kept her fans updated with a steady stream of snaps from their visit, including some very PDA-heavy shots of her and Levi snogging.
In one particularly steamy picture, the pair are locking lips as a fireworks display goes off behind them.