diff --git a/extensions-builtin/sd_forge_stylealign/scripts/forge_stylealign.py b/extensions-builtin/sd_forge_stylealign/scripts/forge_stylealign.py
new file mode 100644
index 00000000..ab44be01
--- /dev/null
+++ b/extensions-builtin/sd_forge_stylealign/scripts/forge_stylealign.py
@@ -0,0 +1,57 @@
+import gradio as gr
+
+from modules import scripts
+import ldm_patched.ldm.modules.attention as attention
+
+
+def sdp(q, k, v, transformer_options):
+    return attention.optimized_attention(q, k, v, heads=transformer_options["n_heads"], mask=None)
+
+
+class StyleAlignForForge(scripts.Script):
+    def title(self):
+        return "StyleAlign Integrated"
+
+    def show(self, is_img2img):
+        # make this extension visible in both txt2img and img2img tab.
+        return scripts.AlwaysVisible
+
+    def ui(self, *args, **kwargs):
+        with gr.Accordion(open=False, label=self.title()):
+            shared_attention = gr.Checkbox(label='Share attention in batch', value=False)
+
+        return [shared_attention]
+
+    def process_before_every_sampling(self, p, *script_args, **kwargs):
+        # This will be called before every sampling.
+        # If you use highres fix, this will be called twice.
+
+        shared_attention = script_args[0]
+
+        if not shared_attention:
+            return
+
+        unet = p.sd_model.forge_objects.unet.clone()
+
+        def join(x):
+            b, f, c = x.shape
+            return x.reshape(1, b * f, c)
+
+        def attn1_proc(q, k, v, transformer_options):
+            b, f, c = q.shape
+            o = sdp(join(q), join(k), join(v), transformer_options)
+            b2, f2, c2 = o.shape
+            o = o.reshape(b, b2 * f2 // b, c2)
+            return o
+
+        unet.set_model_replace_all(attn1_proc, 'attn1')
+
+        p.sd_model.forge_objects.unet = unet
+
+        # Below codes will add some logs to the texts below the image outputs on UI.
+        # The extra_generation_params does not influence results.
+        p.extra_generation_params.update(dict(
+            stylealign_enabled=shared_attention,
+        ))
+
+        return