How do you send fan mail on Tumblr?
When you know who you want to fan mail, just click on your inbox on the top right corner (the letter icon) and on the right hand side of the page there is a blue box which says "Send Fan Mail"
You can send Gwen Stefani fan mail at her official fan mail address listed below. Most celebrities do not have fan phone numbers or email addresses so normally the only way to send them stuff is through their fan mail address. Fan Mail Address: Gwen Stefani Azoff Music Management 1100 Glendon Avenue Suite 2000 Los Angeles, CA 90024-3524 USA