diff --git a/sklearn/cluster/_affinity_propagation.py b/sklearn/cluster/_affinity_propagation.py
index 180e37996aa07..586b6c2c905a4 100644
--- a/sklearn/cluster/_affinity_propagation.py
+++ b/sklearn/cluster/_affinity_propagation.py
@@ -12,8 +12,8 @@
 
 from ..exceptions import ConvergenceWarning
 from ..base import BaseEstimator, ClusterMixin
-from ..utils import as_float_array, check_random_state
-from ..utils._param_validation import Interval, StrOptions
+from ..utils import check_random_state
+from ..utils._param_validation import Interval, StrOptions, validate_params
 from ..utils.validation import check_is_fitted
 from ..metrics import euclidean_distances
 from ..metrics import pairwise_distances_argmin
@@ -178,6 +178,12 @@ def _affinity_propagation(
 # Public API
 
 
+@validate_params(
+    {
+        "S": ["array-like"],
+        "return_n_iter": ["boolean"],
+    }
+)
 def affinity_propagation(
     S,
     *,
@@ -269,13 +275,11 @@ def affinity_propagation(
     Brendan J. Frey and Delbert Dueck, "Clustering by Passing Messages
     Between Data Points", Science Feb. 2007
     """
-    S = as_float_array(S, copy=copy)
-
     estimator = AffinityPropagation(
         damping=damping,
         max_iter=max_iter,
         convergence_iter=convergence_iter,
-        copy=False,
+        copy=copy,
         preference=preference,
         affinity="precomputed",
         verbose=verbose,
diff --git a/sklearn/tests/test_public_functions.py b/sklearn/tests/test_public_functions.py
index cef75b9be9d4b..6dad08db1a5c3 100644
--- a/sklearn/tests/test_public_functions.py
+++ b/sklearn/tests/test_public_functions.py
@@ -131,6 +131,7 @@ def test_function_param_validation(func_module):
 
 PARAM_VALIDATION_CLASS_WRAPPER_LIST = [
     ("sklearn.decomposition.non_negative_factorization", "sklearn.decomposition.NMF"),
+    ("sklearn.cluster.affinity_propagation", "sklearn.cluster.AffinityPropagation"),
     ("sklearn.covariance.ledoit_wolf", "sklearn.covariance.LedoitWolf"),
     ("sklearn.covariance.oas", "sklearn.covariance.OAS"),
 ]