My fianc�e wants his mum to watch my delivery!!!?

Am i being silly or do you find it weird that he wants his mum there with us when i have my first baby in 4 months ??!?!?! my mum said she might not get there in time because she lives far away but she will try her best, so later on in the car my fiancee said i should ask his mum to come and watch!!!! i flipped out and said that it's just gross... i hardly know her like i know my own mum, if my mum can't come i want my best friend there because we're practically like sisters. Anyway when i shouted at him he said that i'm really nasty for not wanting her there, i just don't want her seeing me all naked shooting a baby out of me. its a special day and it would make me uncomfortable. What should i do???