Okay because it was requested here it is. As far as I could tell only three actress' have played Lana in live action.

Annette O'Toole Superman III

Stacy Haiduk The Adventures of Superboy.

Kristen Kreuk Smallville.

My list.

#1 Stacy Haiduk Again I had a crush on her back when Superboy was on.

#2 Annette O'Toole Cute, sweet & a red head.

#3 Kristen Kreuk Very cute but not my idea of Lana Lang not a red head and not a snoopy little gal trying to prove that Clark is Superboy. I know, I know Clark isn't Superboy on Smallville. So sue me I grew up reading Silver-Age comic books. 

Actress Emily Proctor played Lana for one episode of "Lois & Clark", titled "Tempus, Anyone?"

Annette by far the best thing about Superman III.

#3 Kristen Kreuk Very cute but not my idea of Lana Lang not a red head and not a snoopy little gal trying to prove that Clark is Superboy. I know, I know Clark isn't Superboy on Smallville. So sue me I grew up reading Silver-Age comic books. 

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The funny thing here is that Chloe is more "Lana" than Lana is. Lana was always basically "Superboy's Lois Lane," which Chloe is depicted as. Lana is always getting in trouble and attempting to expose Superboy's identity, and Chloe has even done some version of the latter during the second/third season of SMALLVILLE.

Kristin Kreuk could have played the same character almost just with a different name (make her Chloe). I would imagine that if a comics fan watched an episode casually, he might assume that Chloe was meant to be Lana.

Granted, they tried last year to make KK's Lana more "Lana-like" with her whole crazy "magic" storyline.

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What's often annoying about colorblind casting is that Hollywood winds up making the token gesture and then being caught by the other taboos. They cast a black guy as Pete Ross but can't do anything with him so far as romantic triangles go (otherwise, Clark/Pete/Lana would have been a no-brainer). The producer even admitted that part of the reason the character was written out was because "of the actor we cast." (This either is a grudging admission of the race issue or the fact that the actor was just not attractive enough to believably be part of a Clark/Lana or Clark/Chloe triangle -- granted, neither option would probably make the actor feel that great about himself).

So, they cast the wrong person for Pete Ross and then cast the "right Pete Ross" in a completely different role (Whitney). Only in Hollwyood.