Hi guys

I feel like a real dork asking this, it should be a simple fix, but for some reason I can't get it to work.
Basically I need to redirect this subdomain - weddings.alexandrabignell.com.au - to
http://alexandrabignell.com.au/wedding .
I've tried a standard cPanel subdomain redirect - no luck. I've tried a basic .htaccess redirect, no luck there either. I think it's because of the friendly URLs, the redirect keeps adding a slash to the end which turns it into a folder, e.g.
http://alexandrabignell.com.au/wedding/
(which of course doesn't work).
It's quality hosting so I don't think it's a hosting issue. Anyone have any suggestions for a fix, or any modx revo specific .htaccess redirect code I could try?
Thanks in advance
Harmony
MODx Revolution 2.2.8 pl (Traditional) | PHP Version 5.3.26