Rihanna celebrated her 26th birthday in style yesterday (February 20) - posing for a series of bikini pics in the snow.

The We Found Love singer took to Instagram to document her birthday celebrations, which took place in Aspen, Colorado.

After posting a series of images of herself playing in the snow wearing a pink coat, RiRi then showed off her birthday cake - which was iced with the words 'She X 26' - by a log fire as she raised a glass of bubbly to the camera.

And in true Rihanna style, the Bajan babe stripped down to a tiny white-two piece for some more snow action, as she donned a oversized leather coat and ski goggles for the snaps.

Branding herself a "Snow Bunny", the star completed her Instagram spree with a photo of herself in a hot tub, wearing one glove and a enjoying a cigarette.

While RiRi spent her birthday in Aspen, pal Cara Delevingne took to the social-networking site to share an image of herself and Rihanna from a previous Victoria's Secret fashion show to wish the singer a happy birthday.

Cara wrote alongside the pic: "Happy birthday @badgalriri This picture means so much to me because it was the first time we met and you have been such an incredible friend ever since.

"You are such a strong and truly inspiring woman and i am so lucky to have you in my life! I love you boo and thank you for supporting me through so much."

Happy Birthday Ri!