Kaley Cuoco stars as Penny, Sheldon and Leonard's beautiful next door neighbor.  Penny is an aspring actress that currently works at the local Cheesecake Factory.

Penny moved across the halls from the boys after her split from her boyfriend of four years, Kurt.  She briefly dated Sheldon, but it did not work out due to her insecurity about her intelligence.

Penny Quotes

Sweetie, let me put this in a way you'll understand. From the waist down, my shields are up.

Penny

Ok, so the same with extra spit on Sheldon's hamburger.

Penny
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TBBT Quotes

[Raj whispers in Wolowitz's ear]
Penny: What did he say?
Wolowitz: He compared Sheldon to a disposable feminine cleansing product one might use on a summer's eve.
Penny: Yeah, and the bag it came in

[reading on wall] "See you in hell Sheldon."
The most frightening thing about that is the missing comma.

Sheldon