I don't like rating people on their looks. She is very attractive. But I'll bet for every guy who likes a woman with a big butt, there's a guy who likes a woman with a small butt. I think she's attractive, but I'm sure there are many who think she's no big deal. It's all very personal, and in some ways, what we find attractive is what we see of celebrities in movies, magazines, and on TV. It's pretty arbitrary, and it varies by culture.
The point is, you have to love yourself, however big or small your butt is. There are lots of guys who will be into the way you look, either way.