Awesome! I wrote to her in January 2011 and then just recently a few weeks ago. Still waiting to see if she responds.

Wow, I didn't expect to get this back, I actually wanted to wrote her another letter. I love Natalia Tena in Harry Potter, About a Boy and in Game of Thrones. Unfortunately, she misspelled my name on both photos (wrote Katha instead of Katka). It'd happened to me quite a lot, so I've decided to write my address differently, but it was after I sent my request to Natalia.

19th July 2011 sent LOR, SASE and two photos
24th August 2012 got my photos back signed with messages on their backs

Address:
Natalia Tena
Curtis Brown Group Ltd.
Haymarket House
5th Floor
28-29 Haymarket
London SW1Y 4SP
UK

Photos:
http://katkasautographs.webs.com/apps/photos/photo?photoid=163968552
http://katkasautographs.webs.com/apps/photos/photo?photoid=163968553
http://katkasautographs.webs.com/apps/photos/photo?photoid=163968554
http://katkasautographs.webs.com/apps/photos/photo?photoid=163968555

Envelope:
http://www.imagebam.com/image/7fa500207966772