Forms Authentication - Display Newest Member

Hi,
This is a simple question I'm sure, but how to you find out the newest member when using the ASP.Net Forms Authentication (Membership, MembershipUser, etc)
I want to display the newest member as you would see in a discussion forum, but can't seem to find which method will provide this for me. I would assume there is a built in method to give this to me rather than having to query the database using order by, etc.

I know there is Membership.GetAllUsers() and Membership.GetNumberOfUsersOnline(), but nothing for the newest user.
Thanks in advance.
Grant.
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