diff --git a/la_chariotte/helpers/fixtures.py b/la_chariotte/helpers/fixtures.py
index 2d5e026..b3a8f40 100644
--- a/la_chariotte/helpers/fixtures.py
+++ b/la_chariotte/helpers/fixtures.py
@@ -4,6 +4,7 @@ import pytest
 from django.utils import timezone
 
 from la_chariotte.order.models import GroupedOrder, Item
+from la_chariotte.tests.utils import create_grouped_order
 
 
 @pytest.fixture
@@ -23,6 +24,18 @@ def other_user(django_user_model):
     return user
 
 
+@pytest.fixture
+def authenticated_user_with_name(django_user_model):
+    username = "toto@gmail.com"
+    password = "tata"
+    first_name = "boule"
+    last_name = "bill"
+    user = django_user_model.objects.create_user(
+        username=username, password=password, first_name=first_name, last_name=last_name
+    )
+    return user
+
+
 @pytest.fixture
 def simple_grouped_order(other_user):
     date = timezone.now().date() + datetime.timedelta(days=30)
@@ -39,6 +52,19 @@ def simple_grouped_order(other_user):
     return grouped_order
 
 
+@pytest.fixture
+def connected_grouped_order(client, authenticated_user_with_name):
+    client.force_login(authenticated_user_with_name)
+    grouped_order = create_grouped_order(
+        name="Test grouped order",
+        orga_user=authenticated_user_with_name,
+        days_before_delivery_date=30,
+        days_before_deadline=5,
+    )
+    item = Item.objects.create(name="test item", grouped_order=grouped_order, price=2)
+    return grouped_order
+
+
 @pytest.fixture(autouse=True)
 def password_hasher_setup(settings):
     # Use a weaker password hasher during tests, for speed
diff --git a/la_chariotte/order/models.py b/la_chariotte/order/models.py
index 2733fa9..0aa203f 100644
--- a/la_chariotte/order/models.py
+++ b/la_chariotte/order/models.py
@@ -97,8 +97,6 @@ class GroupedOrder(models.Model):
 class OrderAuthor(models.Model):
     """Used when a user orders (with or without an account)"""
 
-    # TODO faire le lien avec CustomUser (CustomUser hérite de OrderAuthor),
-    # pour ensuite préremplir quand on est connecté·e
     first_name = models.CharField(verbose_name="Prénom")
     last_name = models.CharField(verbose_name="Nom")
     phone = models.CharField(
diff --git a/la_chariotte/order/templates/order/grouped_order_detail.html b/la_chariotte/order/templates/order/grouped_order_detail.html
index 15ad1c4..f8f5660 100644
--- a/la_chariotte/order/templates/order/grouped_order_detail.html
+++ b/la_chariotte/order/templates/order/grouped_order_detail.html
@@ -152,18 +152,18 @@
                         <div class="column">
                             <p><label for="first_name">Prénom : </label>
                                 <input id="first_name" type="text" name="first_name" placeholder="Votre prénom"
-                                       value="{{ author.first_name }}" required></p>
+                                       value="{{ order_author.first_name }}" required></p>
                             <p><label for="first_name">Nom : </label>
                                 <input id="last_name" type="text" name="last_name" placeholder="Votre nom"
-                                       value="{{ author.last_name }}" required></p>
+                                       value="{{ order_author.last_name }}" required></p>
                         </div>
                         <div class="column">
                             <p><label for="phone">Numéro de téléphone :</label>
                                 <input id="phone" type="tel" pattern="[0-9]{10}" placeholder="0601020304" name="phone"
-                                       value="{{ author.phone }}" required></p>
+                                       value="{{ order_author.phone }}" required></p>
                             <p><label for="email">Adresse mail : </label>
                                 <input id="email" type="email" placeholder="exemple@mail.fr" name="email"
-                                       value="{{ author.email }}" required></p>
+                                       value="{{ order_author.email }}" required></p>
                         </div>
                     </div>
                     <p><label for="note">Note à l'organisateur·ice</label>
diff --git a/la_chariotte/order/views/grouped_order.py b/la_chariotte/order/views/grouped_order.py
index 4457f09..7a87ff4 100644
--- a/la_chariotte/order/views/grouped_order.py
+++ b/la_chariotte/order/views/grouped_order.py
@@ -117,12 +117,23 @@ class GroupedOrderDetailView(generic.DetailView):
         remaining_qty = {item.id: item.get_remaining_nb() for item in items}
         prices_dict = {item.id: item.price for item in items}
 
+        if self.request.user.is_authenticated:
+            order_author = OrderAuthor.objects.create(
+                first_name=self.request.user.first_name,
+                last_name=self.request.user.last_name,
+                email=self.request.user.username,
+            )
+            order_author.save()
+        else:
+            order_author = None
+
         context = super().get_context_data(**kwargs)
         context.update(
             {
                 # Used for the js display of total price of an order
                 "prices_dict": json.dumps(prices_dict, cls=DjangoJSONEncoder),
                 "remaining_qty": remaining_qty,
+                "order_author": order_author,
             }
         )
         return context
diff --git a/la_chariotte/tests/test_order_views_grouped_order.py b/la_chariotte/tests/test_order_views_grouped_order.py
index 4eaa729..83f5dfd 100644
--- a/la_chariotte/tests/test_order_views_grouped_order.py
+++ b/la_chariotte/tests/test_order_views_grouped_order.py
@@ -4,14 +4,14 @@ from io import StringIO
 
 import pytest
 from django.contrib import auth
+from django.contrib.auth import get_user
 from django.forms.utils import to_current_timezone
 from django.urls import reverse
 from django.utils import timezone
-from icalendar import Calendar
+from icalendar import Calendar, vText
 
 from la_chariotte.order import models
-
-from .utils import create_grouped_order, order_items_in_grouped_order
+from la_chariotte.tests.utils import create_grouped_order, order_items_in_grouped_order
 
 pytestmark = pytest.mark.django_db
 
@@ -215,11 +215,32 @@ class TestJoinGroupedOrderView:
         response = client.post(join_url, {"code": "123456"})
 
         assert (
-            "nous ne trouvons aucune commande avec ce code" in response.content.decode()
+            "Désolé, nous ne trouvons aucune commande avec ce code"
+            in response.content.decode()
         )
 
 
 class TestGroupedOrderDetailView:
+    def test_order_item_with_authenticated_user(self, client, connected_grouped_order):
+        detail_url = reverse(
+            "order:grouped_order_detail",
+            kwargs={
+                "code": connected_grouped_order.code,
+            },
+        )
+        response = client.get(detail_url)
+
+        assert response.status_code == 200
+
+        order_author = response.context[0]["order_author"]
+        current_user = get_user(client)
+
+        assert order_author is not None
+
+        assert order_author.first_name == current_user.first_name
+        assert order_author.email == current_user.username
+        assert order_author.last_name == current_user.last_name
+
     def test_order_item(self, client, other_user):
         """
         From the OrderDetailView, we order an item using the order form, and it creates an models.Order with an Ordered_item inside
@@ -300,7 +321,9 @@ class TestGroupedOrderDetailView:
         # OrderedItems are not created when the ordered quantity is 0
         assert models.OrderedItem.objects.count() == 2
 
-    def test_order_item__no_articles_ordered(self, client, other_user):
+    def test_order_item__no_articles_ordered(
+        self, client, authenticated_user_with_name
+    ):
         """
         From the OrderDetailView, we order without having changed any item quantity.
         An error is raised.
@@ -310,7 +333,7 @@ class TestGroupedOrderDetailView:
             days_before_delivery_date=5,
             days_before_deadline=2,
             name="gr order test",
-            orga_user=other_user,
+            orga_user=authenticated_user_with_name,
         )
         item = models.Item.objects.create(
             name="test item 1", grouped_order=grouped_order, price=1
@@ -336,10 +359,10 @@ class TestGroupedOrderDetailView:
             order_url,
             {
                 f"quantity_{item.pk}": [0, 0],
-                "first_name": "Prénom test",
-                "last_name": "Nom test",
+                "first_name": {authenticated_user_with_name.first_name},
+                "last_name": {authenticated_user_with_name.last_name},
                 "phone": "0645632569",
-                "email": "test@mail.fr",
+                "email": {authenticated_user_with_name.email},
                 "note": "test note",
             },
         )
@@ -348,12 +371,14 @@ class TestGroupedOrderDetailView:
             response.context["error_message"]
             == "Veuillez commander au moins un produit"
         )
-        assert response.context["author"].first_name == "Prénom test"
+        assert (
+            response.context["author"].first_name
+            == authenticated_user_with_name.first_name
+        )
         content = response.content.decode()
-        assert "Prénom test" in content
-        assert "Nom test" in content
-        assert "0645632569" in content
-        assert "test@mail.fr" in content
+        assert authenticated_user_with_name.first_name in content
+        assert authenticated_user_with_name.last_name in content
+        assert authenticated_user_with_name.email in content
         assert "test note" in content
         assert not models.Order.objects.first()
         assert not models.OrderAuthor.objects.first()