Rihanna has neither confirmed nor denied undergoing plastic surgery, making it challenging to ascertain the exact cost of any procedures. However, estimates based on average prices of cosmetic surgeries in the US suggest she might have spent approximately $15,000 to $20,000 on a potential nose job and $10,000 to $15,000 on a hypothetical breast augmentation. These are rough approximations, and actual costs vary based on factors like the surgeon's expertise, technique, location, and other variables.