I saw a gal who was a professional stage actress, which was her main day job.

 
She was, of course, very careful not to ever put her face on her escort materials.

 
And yes, she was quite convincing in her role.

Was able to do an overnight with a mainstream actress who was well-known but not yet A-list. She was extremely UTR and pretty much only available by referral from a friend of hers who I had seen.  It was a once in a lifetime chance but ultimately not worth the ridiculous investment.

Saw at least one that had been in a couple movies and TV shows. Nothing huge, and I think she was trying to get out of it. Really, really wanted to see her again, but unfortunately she passed before I could. I use a few agencies that deal with more "legit" celebrities and models, not porn stars.

In the late 90s I spent a night with stunningly attractive A-lister who had been in several movies.  She was the female lead in one of the movies that is part of an iconic franchise from that time.

She was in town rehearsing for a traveling version of a stage play where she was the star.  Apparently she had a bad day at rehearsal and decided to walk out and be alone. She ended up in a local bar near the theater district where my friend was the bartender. On a Tuesday night I went to see my friend at the bar and have a few beers. The place was deserted, just her, my friend and me.  Eventually we started chatting and just hung out with no intention of anything. After a few hours she decided it was time for her to go back to her hotel.  She said she wanted to walk.  Since it was now dark, my bartender friend insisted I walk her to her hotel.

I walked her to the door of her hotel and politely said goodnight and admitted I was star-struck.  She complimented me for being very nice and polite and gave me a hug and a kiss on the cheek.  After we said goodbye, she turned back and asked if I wanted to join her in her room for a nightcap... you can guess the rest.

I spent the full night. After more fun in the morning, she put on bright red lipstick and kissed a piece of stationary leaving a classic kiss mark and wrote a short note, with her autograph.  I still have it today.

This happened before I was married, but my wife eventually found the note.  She was shocked.  Given the nature of the note, it was clear we had been intimate.  All my wife said was, "I can't believe you fucked ________ ______".