Someone once said I looked like Princess Diana, and said it like duh, I must get that all the time. But that’s the only time I’ve gotten it, and I don’t look like her at all, so that was weird. A couple people said Mira Sorvino and a couple people said Tina Fey. I think that’s it. Actually, a pizza deliveryman said…that person Tom Cruise was/is married to? Kate something? But my sister said that doesn’t count because people say every skinny dark-haired young woman looks like her (I was skinny at the time 
).
Morrissey. I hate Morrissey.
Brian Dennehy, apparently. Heard it from more than one person.
I’ve been told John Cusack, Sean Penn and Alan Rickman (especially when my hair is longer) on several occasions. Which I guess makes sense as we all have dark hair, are sort of medium build, medium tall-ish, sort of everyman-ish looking and constantly make glib comments.
Best: Wayne Newton
Worst: Mall Cop
Luckily I lean more towards Wayne Newton if I keep my weight down and don’t grow that mustache again.
It depends on the age of the person. Older people tell me I look like a young Lauren Bacall. People my age and younger tell me Michelle Pfeiffer. 
I’ve been told Fran Drescher. Eek!
On the other hand, I do look a LOT like Martha Plimpton, especially when she and I were both younger. I didn’t actually see The Goonies until a few years ago and it really kind of freaked me out, because she and I also have very similar body language and it was like watching a younger me.
In college, around 2000, someone said I looked like Jennifer Connelly
Then just a few years ago, someone told me that I looked like Alison Brie. Wow, I wish I really did! I can maybe kinda sorta see what he meant in that I have shoulder length brown hair (which was darker at the time) and big eyes. That’s about it - and absolutely no resemblance below the neck, sadly.
To this day, my dad’s friends still tease him about the fact that in the early 80s, some drunk woman in a bar told him he looked like Alan Alda. She must have been really drunk.
When I was younger, Sondra Locke (which I don’t get at all) and Jaclyn Smith (we had the same hair at the time, so I can see that one). More recently, Debra Messing (from Will & Grace) and Sarah Clarke (from 24).
Malcolm McDowell or James Spader.
I don’t feel creepy, though.
Well, that completely changes my mental image of you. My brain has been adding an extra s and reading your username as Ms Smith537 this whole time.
George Clooney.
takes one long step back
ditches any pieces of metal
I’ve gotten Andrew McCarthy, Tobey Maguire, and James Spader before.
I look just like that black actor who wears glasses. No need to be more specific, apparently I look like all of them. 
I sound like James Earl Jones (tone) or Morgan Freeman (accent). So picture Darth Vader saying “Luke, I’m trying to drive you to the store!”
Gru in Despicable Me.
Apparently I look like no one.
Nancy McKeon (Jo from “The Facts of Life”) and, more recently, Zachary Quinto.
The one I used to get when I was younger was Audrey Hepburn. But I’ve aged and she’s been dead a long time now.