It is absolutely ok. You would just need to be sure to coordinate your GYN and plastic surgeon, assuring that they operate in the same place.
Yes it is possible. It really depends on your GYN surgeon and the location of the surgery. If you live in D.C., you must be certain that the hospital or surgery center has a special cosmetic surgery fee schedule which will help reduce your costs for the cosmetic breast augmentation. Obviously, both surgeons must have operating privileges at the same facility.