有名人と写真を撮ったって英語でなんて言うの？

If someone is very well-known, you can say they are "famous". A person who is famous for entertainment (e.g. a singer, an actor, a sportsperson) is called a "celebrity" or "celeb".

When you successfully "take a photo" of something,, you can say that you "got a photo".

To express that you took a photo with someone famous you may say the following;
I took a photo with a celebrity.
I was photographed with a celebrity.
I got to take a picture with one of my idols.
I got the opportunity to be photographed with one of my countries pop culture influencers.
keywords: took a photo with, was photographed with, got to take a picture with...

If someone else takes the photo, the first example sentence is the more appropriate (passive form).
If you yourself take the photo, the second sentence is the one to use.

It is okay to use both '.got'' my photo taken and ''had'' my photo taken'

To ''take a selfie'' is when you hold the camera yourself and using the front camera to take a picture with yourself in it.

You can of course use the celebrities name in order to give more information.
Example:
I had my photo taken with Ed Sheeran!

In American English, someone who is very popular or famous is referred to as a "celebrity." Since someone took your picture, you can say that "I had my picture taken."

I hope that this helps :)

I would say: "I took a selfie with a celebrity!" Selfie means taking the picture yourself. If someone else took the picture, you could say: "I got my picture taken with a celebrity!". Celebrity = famous person. The ! adds excitement to what you are saying.

I hope this helps! :)

A person who is well known or 'famous' is also called a 'celebrity'
If someone has taken your photo then you would say 'I had my photo taken' but you could also say 'I got a photo with....'

If you want to explain that you took a photo with a famous person, you can say:
"I took a photo with a celebrity!"
"I managed to get a photo with a celebrity!"