Rihanna Showcases New Tattoo in Honor of Late Grandmother — Photo

Rihanna is keeping the memory of her late grandmother close to her heart -- literally.

The singer added yet another tattoo to her ever-growing collection when she inked a likeness of the Egyptian goddess Isis between her breasts. The 24-year-old pop star posted a picture of the tat on her Instagram account, along with the message, "Goddess Isis - Complete Woman - Model for future generations - #GRANGRANDOLLY - always in and on my heart #1love."

While RiRi maintained modesty by covering her breasts with her arm, the picture shows a sizeable image of the goddess, who is recognized for representing the ideal mother in Egyptian culture.

Rihanna publicly mourned the loss of her grandmother, who passed away June 30, when she expressed her grief via Twitter. The tattoo is just another step in Rihanna's ongoing transformation. In June, she inked an Egyptian falcon on her ankle, and last week she graced the 2012 MTV VMAs red carpet with a freshly-shorn pixie cut.