As Selena Gomez performed in Mandalay Bay in Vegas on Saturday night, her fans were treated to something new . . . a tattoo on her wrist! It comes after the Disney darling got a henna tattoo of her nickname "Sel" on her shoulder earlier this month. This new addition — of her boyfriend Bieber's name — looks like marker pen to us. What do you think of it? Is Selena getting a little old for pen tatts or do you like this cute reference to her boy Biebs? Vote now!