What is a smart response to say when someone keeps talking about their nails and eyebrows?

this girl who is my friends girlfriend is very superficial and always talks about what the manicurist did to her nails or how the waxer person messed up her eyebrows. what is something smart i can reply to her to not sound super bitchy but make it known that she is superficial.What is a smart response to say when someone keeps talking about their nails and eyebrows?
How about, ';Didn't you already tell us that story?'; or ';Enough, your nails and eyebrows are fine.'; I hope these work. It is really annoying when someone goes on and on about superficial stuff. What is a smart response to say when someone keeps talking about their nails and eyebrows?
A smart response that would make you feel better! Come on! Just change the subject and don't make her feel bad! Start talking about a new song or a movie you watched or boys! Be nice not snotty!
She probably just fishing for compliments.... give her a name and number of another beauty salon that will fix her right up... Then change the subject to something else.