Rihanna‘s got a new tattoo in an interesting location. The “Where Have You Been Singer” tweeted out a picture of her latest tat last night. The tattoo is of the Greek goddess Isis, and goes right under the singer’s breasts. Yep, that’s right. We hate to even think of how much that must have hurt. The tattoo is in honor of Rihanna’s grandmother who died in July. The two were very close, and the goddess Isis represents the “ideal mother and wife as well as the patron of nature and magic.” This is the 20th tattoo for the pop diva. Check it out after the jump.