They say Beauty is in the eye of the beholder and I agree, but do you feel there are some actresses out there that are just very unique in appearance? no one can look like them. No has ever looked like them? they dont even have to be the standard stereotype of beautiful which is how I saw Grace Kelly,
For me the most unique looking actress is Audrey Hepburn
I know she was a big star at the time of Marylin Monroe, who is considered the most iconic actress of that era but I just never felt like Marylin's appearance was unique. There have and can be many Marilyns in appearance. In fact Marilyn was not even the first of her kind. it was Jean Harlow, who died sadly due to health issues at a young age of 26 and Marylin took her place as the blonde bombshell when she became a big star , there were many other actresses like Lana Turner, Jayne Mansfield and Betty Grable who fitted that blond bombshell stereotype also. Nothing Unique about that.
Audrey was just very different.
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Other honourable mentions would be Mischa Barton, Zoe Saldana, Angelina Jolie, Catherine Zeta Jones, Aisha Tyler (Charlie from Friends) and Lily Collins. These are modern actresses who also look unique to me.