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diff --git a/tools/internal_ci/linux/psm-interop-build-cpp.sh b/tools/internal_ci/linux/psm-interop-build-cpp.sh
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+++ b/tools/internal_ci/linux/psm-interop-build-cpp.sh
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+#!/usr/bin/env bash
+# Copyright 2024 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+set -eo pipefail
+
+#######################################
+# Builds test app Docker images and pushes them to GCR.
+# Called from psm_interop_kokoro_lib.sh.
+#
+# Globals:
+#   SRC_DIR: Absolute path to the source repo on Kokoro VM
+#   SERVER_IMAGE_NAME: Test server Docker image name
+#   CLIENT_IMAGE_NAME: Test client Docker image name
+#   GIT_COMMIT: SHA-1 of git commit being built
+#   DOCKER_REGISTRY: Docker registry to push to
+# Outputs:
+#   Writes the output of docker image build stdout, stderr
+#######################################
+psm::lang::build_docker_images() {
+  local client_dockerfile="tools/dockerfile/interoptest/grpc_interop_cxx_xds/Dockerfile.xds_client"
+  local server_dockerfile="tools/dockerfile/interoptest/grpc_interop_cxx_xds/Dockerfile.xds_server"
+  psm::build::docker_images_generic "${client_dockerfile}" "${server_dockerfile}"
+}