rails4 pluck with order and limit

In my sidebar I display the freshly created user profiles. Profile belongs_to user and user has_one_profile. I realized that I only use 3 columns from the profile table so it would be better to use pluck. I also have a link_to user_path(profile.user) in the partial, so somehow I have to tell who the user is. At the moment I'm using includes, but I don't need the whole user table. So I use to many columns both from the user and the profile tables.

How can I optimize this with pluck? I tried a few versions, but always got some error (most of the time profile.user is not defined).

My current code:

def set_sidebar_users
  @profiles_sidebar = Profile.order(created_at: :desc).includes(:user).limit(3) if user_signed_in?
end

create_table "profiles", force: :cascade do |t|
  t.integer  "user_id",      null: false
  t.string   "first_name",   null: false
  t.string   "last_name",    null: false
  t.string   "company",      null: false
  t.string   "job_title",    null: false
  t.string   "phone_number"
  t.text     "description"
  t.datetime "created_at"
  t.datetime "updated_at"
  t.string   "avatar"
  t.string   "location"
end