diff --git a/lib/blueprinter/extension.rb b/lib/blueprinter/extension.rb
index f6c75dca..65010af6 100644
--- a/lib/blueprinter/extension.rb
+++ b/lib/blueprinter/extension.rb
@@ -5,10 +5,10 @@ module Blueprinter
   # Base class for all extensions.
   #
   # V2 hook call order:
-  #  - sort_fields
   #  - collection? (skipped if calling render_object/render_collection)
   #  - input_object | input_collection
   #  - prepare
+  #  - blueprint_fields
   #  - blueprint_input
   #  - exclude_field?
   #  - field_value
@@ -23,16 +23,6 @@ module Blueprinter
   #  - pre_render
   #
   class Extension
-    #
-    # Returns fields in the order they should appear. Default is the order in which they were defined.
-    #
-    # @param fields [Array<Blueprinter::V2::Field|Blueprinter::V2::Object|Blueprinter::V2::Collection>]
-    # @return [Array<Blueprinter::V2::Field|Blueprinter::V2::Object|Blueprinter::V2::Collection>]
-    #
-    def sort_fields(fields)
-      fields
-    end
-
     #
     # Returns true if the given object should be treated as a collection (i.e. supports `map { |obj| ... }`).
     #
@@ -51,6 +41,18 @@ def collection?(_object)
     #
     def prepare(context); end
 
+    #
+    # Returns the fields that should be included in the correct order. Default is all fields in the order in which they were defined.
+    #
+    # NOTE Only runs once per Blueprint per render.
+    #
+    # @param context [Blueprinter::V2::Context]
+    # @return [Array<Blueprinter::V2::Field|Blueprinter::V2::Object|Blueprinter::V2::Collection>]
+    #
+    def blueprint_fields(ctx)
+      []
+    end
+
     #
     # Modify or replace the object passed to render/render_object.
     #
diff --git a/lib/blueprinter/v2/extensions/collections.rb b/lib/blueprinter/v2/extensions/collections.rb
index b01e79f3..52e30846 100644
--- a/lib/blueprinter/v2/extensions/collections.rb
+++ b/lib/blueprinter/v2/extensions/collections.rb
@@ -12,6 +12,10 @@ def collection?(object)
           else false
           end
         end
+
+        def blueprint_fields(ctx)
+          ctx.blueprint.class.reflections[:default].ordered
+        end
       end
     end
   end
diff --git a/lib/blueprinter/v2/extensions/field_order.rb b/lib/blueprinter/v2/extensions/field_order.rb
index 987ac2fe..b5cb94c7 100644
--- a/lib/blueprinter/v2/extensions/field_order.rb
+++ b/lib/blueprinter/v2/extensions/field_order.rb
@@ -8,8 +8,8 @@ def initialize(&sorter)
           @sorter = sorter
         end
 
-        def sort_fields(fields)
-          fields.sort(&@sorter)
+        def blueprint_fields(ctx)
+          ctx.blueprint.class.reflections[:default].ordered.sort(&@sorter)
         end
       end
     end
diff --git a/lib/blueprinter/v2/reflection.rb b/lib/blueprinter/v2/reflection.rb
index ca90aff5..92d9d8e4 100644
--- a/lib/blueprinter/v2/reflection.rb
+++ b/lib/blueprinter/v2/reflection.rb
@@ -39,8 +39,8 @@ class View
         attr_reader :objects
         # @return [Hash<Symbol, Blueprinter::V2::Collection>] Associations to collections defined on the view
         attr_reader :collections
-        # @return [Array] All fields, objects, and collections ordered by the field_order extension hook (default is the order in which they were defined)
-        attr_reader :sorted
+        # @return [Array<Blueprinter::V2::Field|Blueprinter::V2::Object|Blueprinter::V2::Collection>] All fields, objects, and collections in the order they were defined
+        attr_reader :ordered
 
 
         # @param blueprint [Class] A subclass of Blueprinter::V2::Base
@@ -48,7 +48,7 @@ class View
         # @api private
         def initialize(blueprint, name)
           @name = name
-          @sorted = blueprint.serializer.hooks.last(:sort_fields, blueprint.schema.values) || blueprint.schema.values
+          @ordered = blueprint.schema.values
           @fields = blueprint.schema.select { |_, f| f.is_a? Field }
           @objects = blueprint.schema.select { |_, f| f.is_a? ObjectField }
           @collections = blueprint.schema.select { |_, f| f.is_a? Collection }
diff --git a/lib/blueprinter/v2/serializer.rb b/lib/blueprinter/v2/serializer.rb
index cf0bd63c..cf54b9c1 100644
--- a/lib/blueprinter/v2/serializer.rb
+++ b/lib/blueprinter/v2/serializer.rb
@@ -19,11 +19,11 @@ def initialize(blueprint)
       end
 
       def call(object, options, instances, data)
+        data[blueprint.object_id] ||= prepare! Context.new(instances[blueprint], nil, nil, nil, options, instances, data)
         ctx = Context.new(instances[blueprint], nil, nil, object, options, instances, data)
-        ctx.data[blueprint.object_id] ||= prepare! ctx
         hooks.reduce_into(:blueprint_input, ctx, :object) if @run_blueprint_input
 
-        result = blueprint.reflections[:default].sorted.each_with_object({}) do |field, acc|
+        result = ctx.data[blueprint.object_id][:fields].each_with_object({}) do |field, acc|
           ctx.field = field
           ctx.value = nil
 
@@ -66,7 +66,7 @@ def prepare!(ctx)
         values.prepare ctx
         exclusions.prepare ctx
         hooks.each(:prepare, ctx) if @run_prepare
-        true
+        { fields: hooks.last(:blueprint_fields, ctx).freeze }.freeze
       end
 
       def block_unused_hooks!
diff --git a/spec/extensions/extension_spec.rb b/spec/extensions/extension_spec.rb
index 056eda28..18c2099e 100644
--- a/spec/extensions/extension_spec.rb
+++ b/spec/extensions/extension_spec.rb
@@ -9,9 +9,9 @@
     let(:object) { { foo: 'Foo' } }
     let(:context) { Blueprinter::V2::Context }
 
-    it 'should default sort fields to the given order' do
-      fields = [Blueprinter::V2::Field.new(name: :foo), Blueprinter::V2::Field.new(name: :bar)]
-      expect(subject.new.sort_fields(fields)).to eq fields
+    it 'should default to no fields' do
+      ctx = context.new(blueprint.new, nil, nil, object, {})
+      expect(subject.new.blueprint_fields(ctx)).to eq []
     end
 
     it 'should default collections? to false' do
diff --git a/spec/v2/extensions/collections_spec.rb b/spec/v2/extensions/collections_spec.rb
index 88ec6f6a..78fbcc9f 100644
--- a/spec/v2/extensions/collections_spec.rb
+++ b/spec/v2/extensions/collections_spec.rb
@@ -41,4 +41,15 @@
     x = OpenStruct.new
     expect(subject.collection? x).to be false
   end
+
+  it 'should return all fields in the order they were defined' do
+    blueprint = Class.new(Blueprinter::V2::Base) do
+      field :name
+      object :category, self
+      collection :parts, self
+    end
+    ctx = Blueprinter::V2::Context.new(blueprint.new, nil, nil, nil, {}, {}, {})
+
+    expect(subject.blueprint_fields(ctx).map(&:name)).to eq %i(name category parts)
+  end
 end
diff --git a/spec/v2/extensions/field_order_spec.rb b/spec/v2/extensions/field_order_spec.rb
index 8858e882..0727a316 100644
--- a/spec/v2/extensions/field_order_spec.rb
+++ b/spec/v2/extensions/field_order_spec.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 describe Blueprinter::V2::Extensions::FieldOrder do
+  let(:context) { Blueprinter::V2::Context.new(blueprint.new, nil, nil, nil, {}, {}, {}) }
   let(:blueprint) do
     Class.new(Blueprinter::V2::Base) do
       field :foo
@@ -11,7 +12,7 @@
 
   it 'should sort fields alphabetically' do
     ext = described_class.new { |a, b| a.name <=> b.name }
-    result = ext.sort_fields(blueprint.schema.values)
+    result = ext.blueprint_fields(context)
     expect(result.map(&:name)).to eq %i(bar foo id)
   end
 
@@ -25,7 +26,7 @@
         a.name <=> b.name
       end
     end
-    result = ext.sort_fields(blueprint.schema.values)
+    result = ext.blueprint_fields(context)
     expect(result.map(&:name)).to eq %i(id bar foo)
   end
 end
diff --git a/spec/v2/reflection_spec.rb b/spec/v2/reflection_spec.rb
index b83b9502..8644a237 100644
--- a/spec/v2/reflection_spec.rb
+++ b/spec/v2/reflection_spec.rb
@@ -90,33 +90,12 @@
       expect(blueprint.reflections[:extended].collections.keys).to eq %i(widgets)
     end
 
-    it 'should be in the default order' do
-      names = blueprint.reflections[:default].sorted.map(&:name)
+    it 'should be in the definition order' do
+      names = blueprint.reflections[:default].ordered.map(&:name)
       expect(names).to eq %i(name category)
 
-      names = blueprint.reflections[:extended].sorted.map(&:name)
+      names = blueprint.reflections[:extended].ordered.map(&:name)
       expect(names).to eq %i(name category widgets description)
     end
-
-    it 'should be in a custom order' do
-      ext = Class.new(Blueprinter::Extension) do
-        def initialize(&sorter)
-          @sorter = sorter
-        end
-
-        def sort_fields(fields)
-          fields.sort(&@sorter)
-        end
-      end
-
-      blueprint.extensions << ext.new { |a, b| b.name <=> a.name }
-      blueprint.extensions << ext.new { |a, b| a.name <=> b.name }
-
-      names = blueprint.reflections[:default].sorted.map(&:name)
-      expect(names).to eq %i(category name)
-
-      names = blueprint.reflections[:extended].sorted.map(&:name)
-      expect(names).to eq %i(category description name widgets)
-    end
   end
 end
diff --git a/spec/v2/serializer_spec.rb b/spec/v2/serializer_spec.rb
index 9652ade0..074d8c26 100644
--- a/spec/v2/serializer_spec.rb
+++ b/spec/v2/serializer_spec.rb
@@ -56,6 +56,27 @@
     })
   end
 
+  it 'should respect the blueprint_fields hook' do
+    ext = Class.new(Blueprinter::Extension) do
+      def blueprint_fields(ctx)
+        ctx.blueprint.class.reflections[:default].ordered.sort_by(&:name)
+      end
+    end
+    widget_blueprint.extensions << ext.new
+    widget = {
+      name: 'Foo',
+      category: { name: 'Bar' },
+      parts: [{ num: 42 }, { num: 43 }]
+    }
+
+    result = described_class.new(widget_blueprint).call(widget, {}, instance_cache, {})
+    expect(result.to_json).to eq({
+      category: { name: 'Bar' },
+      name: 'Foo',
+      parts: [{ num: 42 }, { num: 43 }]
+    }.to_json)
+  end
+
   it 'should enable the if conditionals extension' do
     widget_blueprint = Class.new(Blueprinter::V2::Base) do
       field :name