Most people pay homage to dearly departed loved ones with flowers or maybe some bad poetry. But Rihanna? Well, she isn't "most people."

In the past, RiRi has often talked about her affection for her late grandmother, Clara "Dolly" Braithwaite, who died of cancer in July.

But on Sunday afternoon, the pop star -- who made headlines recently when she affectionately embraced her douchebag ex at the VMAs -- set the Twitterverse ablaze when she wrote, "Goddess Isis- Complete Woman - Model for future generations- #GRANGRANDOLLY - always in and on my heart."

Along with that, she included a photo of her new underboob tattoo, a ginormous depiction of a goddess, which could also be seen under the sheer red top she wore while helping close out the 2012 London Paralympics this past weekend.

It's the latest ink for the 24-year-old singer, who already has at least 15 tats -- including a giant falcon on her ankle, stars on the back of her neck, guns on her thigh and ribcage, music notes on her feet and the word "Love" on her finger. (And unlike Demi Lovato, she doesn't seem to have regrets about any of them.)