Johnny Depp
Depp has stated that this tattoo is the most important of the 37 that he has gotten over the course of his life. Located in the crook of his left thumb, the number three symbolizes his infatuation with the "trinity" of the universe and "magical" numbers. Deep says that he is deeply connected to the significance of numbers, the number three being the most fascinating to him.
Rihanna
This shark tattoo actually has a twin on another very famous musician that Rihanna has worked with on many an occasion. Drake has the same one. Both of these tattoos are supposed to symbolize the former relationship that the duo used to have. In particular, this is a reminder of their second date, when Drake took her to the Toronto aquarium and surprised her with a stuffed shark.