Rihanna marked this year's (13) marijuana celebrations on Saturday (20Apr13) by lighting up backstage and feasting on a pot-themed cake.

The We Found Love hitmaker makes no secret she is a fan of weed, and joined the list of stars who sparked up on 20 April (13) - a date which has a special meaning in cannabis culture due to its link to 4.20pm, the time when marijuana lovers like to get high.

Rihanna was in Florida on her Diamonds World Tour when the date fell, and she took time out backstage at the Bb&T Center in Sunrise to smoke.

She also showed off a green cake sculpted into the shape of a marijuana leaf which had been sent to her by devotees.

Uploading a snap of the dessert on Twitter.com, she wrote, "What did I do to deserve the epicness (sic) that is my fans??!!! #420 it's a celebration b**ches!! Thank you to all my Ft. Lauderdale and Miami fam (family) that came through..."

Rihanna continued her rebellious ways after her concert - she spent the night at the King of Diamonds strip club and tweeted pictures of her throwing money at exotic dancers.