Yes, you can really send a letter to Jolin, it's all official!

2015 Jolin's birthday activity (Jolin's birthday is on September 15th)

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Picture from Jolin's Fans Club Facebook

Jolin has been around for 16 years, she has released 13 albums, has lots of hits, has/had lots of endorsements too.
As a consequence there must be something related to her that you treasure the most. It can be something related to her endorsements, a present, or something rare like a cassette or limited edition singles for instance.
Take a picture of it, attach it to the form below, print it and write a message.
Jolin understands English, so there's no need to write your letter in Chinese if you don't speak it.

Download A4 form: https://goo.gl/Tw7heh
Activity details: https://goo.gl/0VBaAI
End of activity: September 8th. Jolin's Fans Club MUST receive your letter before this date.

Address: 40148 台中市東區東光園路177巷33-1號/蔡依林國際歌友會收
Address translation: 40148 Taichung City East - East Road No. 177, Lane 33-1 / Jolin's International Fans Club

Source: Jolin's Fans Club Facebook