This is obviously very hard because we don't really know any of them.
Katy seems down to earth and often pokes fun at herself in many ways so not her.
Beyonce is continually being praised for her humility by celebrities and regular people alike and I've seen nothing that suggest that she is arrogant in anyway.
Rihanna, I don't know if it's just the way she acts/looks but she does seem like the one who would most likely fit the OP's question. The fact that she often tweets about her stats and whatnot means she does care about all that and although it is a form of celebration, it is also a bit boastful to do that especially given the way she chooses to express it.