The 'Pour It Up' hitmaker, who is currently in Aspen to have her birthday bash, posted four shots of her in the sizzling two-piece, reported Daily Mirror.
In one of the sultry snaps, Rihanna donned a pair of ski goggles, hot white two-piece and a jacket draped over her shoulder.
The last shot saw Rihanna relaxing in a hot tub puffing on a cigarette with a hot chocolate.
Rihanna also received a giant cookie cake, iced with the message "She x 26".
Earlier in the week, the 'Diamonds' singer gave her fans a sneak peek into what was a massive, booze-filled bash.