Except getting Lady Gaga onto Google+ won't do much good since nobody would be able to find her. Most of her fans wouldn't think to search for Stefani Joanne Angelina Germanotta.
Not sure what your point is. If you actually think Google would force her to use her real name, then I have a bridge in Brooklyn to sell you. If it is some point about the name wars, it has very little to do with Google+'s traction.
