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Rihanna, Instagram

Instagram

Rihanna celebrated a very special holiday over the weekend, and no, it wasn't the starlet's birthday.

The 24-year-old singer—who has made no secret of her love for marijuana—celebrated 4/20 on Saturday, taking to Twitter to share her details from her day.

#420 it's a celebration bitches!! Thank you to all my ft. Lauderdale and Miami fam that came through #DWT #backstageLife," she captioned a sexy black and white shot where she's smoking while sitting next to a marijuana-themed cake. 

The "Diamonds" singer also posted another close-up pic of the pot-leaf cake, which a loyal fan sent.

"What did I do to deserve the epicness that is my fans??!!! @janiseeaileen gyal you a real top shotta!!!!! Thank you for lighting up my day, no pun intended!! #420Life," Chris Brown's gal wrote.

Rihanna, Instagram

Instagram

The Barbadian beauty showed no signs of the munchies, posting a pic where she's posing in a bikini the following day (and further dispelling those pesky pregnancy rumors). 

Rihanna, Instagram

Instagram

"Shout out to my lover @charliebymz Thank u for designing what has to be my favorite bikini of all time!," the singer wrote, showing off her toned and trim bod.

Stay smokin' hot, girl.