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Sent 1 LOR and SASE back in October 2013 to an address issued by CBS's public relations department via email. On 12/06/2014, I received three different signed photos, which included one of her as Garcia in Criminal Minds. She also enclosed a promo leaflet promoting some stage production she was in.
I will post information of the address I used as soon as possible.
Sorry no scanner.

The address I used was as follows:

Kirsten Vangsness
c/o Criminal Minds
ABC Studios
4585 Electronics Place
Los Angeles, CA 90039
USA

Hi stigduke

Thank you for your feedback

Kirsten Vangsness on Fanmail.biz

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Nice success I have Joe Mantegna autograph who also starring in Criminal Minds ;)