Do you think its cute/funny when really skinny petite girls get fat?

This happended to my gf. We've been dating about four years. When I first met her she was about 5 feet tall and 100lbs. Now she's steadily gained to the point that she's about 155. I don't really know how she gained the weight, guess her metabolism slowed down, but it is cute that she's a big girl now,especially since she used to make fun of big girls. Anyway just wondering your thoughts on this?