>>Hi everybody,
>>
>>I'm writing a letter to Lauren and need to know how to proper address this person. I started Dear Sir, but then had second thought.
>>
>>What do you think?
>>
>>Thanks in advance.
>a- Call Lauren and ask - Are you Ms. Lauren or Mr. Lauren?
>b- Begin with Dear Lauren and say -
> "I don't know whether to address you as Sir or Madame. Which is it?

Do you realize you're replying to a post that's almost 9 years old? :)