Apple Mail question....Deleting To field?

Hi guys,
When I create a new message in Mail, when I type the recipients name or even their email address, it will autocomplete with information in the address book or people i have emailed previously. Well, i updated my address book and these old contacts are still coming up in the To: field when i type there name. Is there a way to clear out that old cache somehow so it doesn't do that any more?

Thanks

 

that was it...

thanks