Cheers to the birthday girl!

Rihanna celebrated her 26th b-day today -- and let her fans in on the action by posting a series of Instagram photos in which she’s scantily clad in an orange tube top, ripped jeans and, of course, a tiara.

In the pics, RiRi playfully poses with a glass of champagne, a candle-laden chocolate cake and a frosted birthday cookie that reads, “She x 26.”

It appears Rihanna began the party a few days early this year though.

In true Rihanna fashion, she kicked off her extravagant b-day bash two days ago in Aspen, Colorado, where she has posted several sexy, snow-filled snapshots.

The "Monster" singer also shared an image of a round of shots, which suggests that the festivities are well underway.

Happy Birthday, Rihanna!

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