She is the only main character whose last name hasn't been mentioned.
Other Relationships Apart from Leonard, Penny has only really had two other somewhat serious relationships that we know about.
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They tried to fix their problem by having Sheldon draw up a relationship agreement for them.
When Sheldon pushed Leonard and Penny to set a date for the wedding, they started to consider what they wanted for their wedding, even though they said they weren't in a rush.
Description: Penny learned that it was actually a real wedding and she was married to Zack. He said he did not want her to feel left out by the progress being made in their friends' relationships, but Penny said she did not feel left out.