How to add a COUNT column to a working query with group() in Rails 3.1

I have a list of UserProfile which may (or may not) have one or more widgets:

class UserProfile < ActiveRecord::Base
  has_many :widgets
end

@all_profiles = UserProfile.joins(:widgets).group('user_profiles.id').order("name ASC")

In the index view, instead of doing a new query in EACH line of the view to get the count of widgets for @all_profile.each, is there a way to add a count column to the original that shows how many widgets were in each grouped row? (Eg, avoid re-querying the database N times if there are N @all_profiles ?

(this is important not only to avoid N extra queries, but it allows us to add a SORT option on the count column so we can sort by customers with the most widgets)