I've seen my 18 year old son naked once in an incidental experience. There was the My mom saw me naked with fully erect penis. What can I do now?.
Saw my son naked at 16 many years after not seeing him that way. Total embarrassment but accidental. I left it and all was well. He is 19 now and last 18 months.
Depending on how comfortable with it you are it is up to you really. Nice to see he thinks you are a beautiful lady anyway.