Rihanna has taken to Instagram to share a cheeky snap from her birthday celebrations in Aspen, Colorado.

The Bajan babe - who turns 26 tomorrow (February 20) - took to the website to post a pic of herself from behind, showing off her bottom in a pair of grey knickers.

RiRi, who is currently sporting a black bob hair style, completed her look with a black and white raglan tee and spotty socks, as she stares a sign in the image that reads 'Welcome To Aspen'.

The Diamonds hitmaker captioned the pic "#cabinlife", before posting another pic, this time of a snowy scene with the comment: "Morning lover... #cabinlife #almost26 #almostdoesntcount #imabe25forever."

She also shared a snap of her chocolate birthday cake, writing next to the image: "I love my team! #BirthdayIsms."

The birthday girl also hit the headlines this week after landing her third Vogue cover, where she reveals she's a huge fan of men's clothes in the accompanying interview.

RiRi stated: "I love baggy things. I wear men’s clothes.

"When I was thirteen or fourteen, I didn’t want to wear what my mom wanted me to wear. I was very much a boy in my style, my demeanour.”