Rihanna arrives at the MTV Video Music Awards on September 6, 2012 in Los Angeles, California. Credit: Jeffrey Mayer/WireImage.com

Rihanna's body art project continues!

The "Where Have You Been" singer, 24, took a break from a jam-packed several days -- a newsmaking-appearance at the MTV Video Music Awards Thursday and a sexy Closing Ceremony performance Sunday at the Paralympics in London -- to share her newest tattoo via Twitter and Instagram.

Sharing a topless (but still PG-13) photo, Rihanna revealed some dramatic new ink on the very top of her ribcage depicting the feathered Egyptian goddess Iris. The latest body art is a tribute to her beloved grandmother, Dolly, who passed away in late June.

"Goddess Isis- Complete Woman," Rihanna writes in the caption for the topless tattoo reveal."Model for future generations- #GRANGRANDOLLY - always in and on my heart #1love."

In London on Sunday, she wowed tens of thousands of fans as she sang "Princess of China" with Coldplay in a seriously steamy performance with frontman (and Gwyneth Paltrow's husband) Chris Martin. At the VMAs in Los Angeles three days earlier, it was her off-stage behavior that caused the most comment: Winning the Video of the Year award for "We Found Love," she hugged and kissed -- on the lips -- her abusive ex-boyfriend Chris Brown.

The chart-topper may or may not have been alluding to her former beau, 23, and their surprising VMAs PDA via Twitter on Saturday with a series of messages. "Heartbreak . . ." she wrote. "I was his Marilyn Monroe . . . A James Dean on the low. What's love without tragedy?"