diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java b/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java
index ab23564..83d415f 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java
@@ -403,6 +403,13 @@
 
             final BiometricPromptLayout view = (BiometricPromptLayout) layoutInflater.inflate(
                     R.layout.biometric_prompt_layout, null, false);
+            /**
+             * View is only set visible in BiometricViewSizeBinder once PromptSize is determined
+             * that accounts for iconView size, to prevent prompt resizing being visible to the
+             * user.
+             * TODO(b/288175072): May be able to remove this once constraint layout is implemented
+             */
+            view.setVisibility(View.INVISIBLE);
             mBiometricView = BiometricViewBinder.bind(view, viewModel, mPanelController,
                     // TODO(b/201510778): This uses the wrong timeout in some cases
                     getJankListener(view, TRANSIT,
diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/ui/binder/BiometricViewBinder.kt b/packages/SystemUI/src/com/android/systemui/biometrics/ui/binder/BiometricViewBinder.kt
index 90e4a38..a7fb6f7 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/ui/binder/BiometricViewBinder.kt
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/ui/binder/BiometricViewBinder.kt
@@ -97,7 +97,13 @@
 
         val iconOverlayView = view.requireViewById<LottieAnimationView>(R.id.biometric_icon_overlay)
         val iconView = view.requireViewById<LottieAnimationView>(R.id.biometric_icon)
-
+        /**
+         * View is only set visible in BiometricViewSizeBinder once PromptSize is determined that
+         * accounts for iconView size, to prevent prompt resizing being visible to the user.
+         *
+         * TODO(b/288175072): May be able to remove this once constraint layout is implemented
+         */
+        iconView.addLottieOnCompositionLoadedListener { viewModel.setIsIconViewLoaded(true) }
         PromptIconViewBinder.bind(
             iconView,
             iconOverlayView,
diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/ui/binder/BiometricViewSizeBinder.kt b/packages/SystemUI/src/com/android/systemui/biometrics/ui/binder/BiometricViewSizeBinder.kt
index 7e16d1e..f340bd8 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/ui/binder/BiometricViewSizeBinder.kt
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/ui/binder/BiometricViewSizeBinder.kt
@@ -30,7 +30,6 @@
 import androidx.core.view.doOnLayout
 import androidx.core.view.isGone
 import androidx.lifecycle.lifecycleScope
-import com.android.systemui.res.R
 import com.android.systemui.biometrics.AuthPanelController
 import com.android.systemui.biometrics.Utils
 import com.android.systemui.biometrics.ui.BiometricPromptLayout
@@ -41,6 +40,8 @@
 import com.android.systemui.biometrics.ui.viewmodel.isNullOrNotSmall
 import com.android.systemui.biometrics.ui.viewmodel.isSmall
 import com.android.systemui.lifecycle.repeatWhenAttached
+import com.android.systemui.res.R
+import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.launch
 
 /** Helper for [BiometricViewBinder] to handle resize transitions. */
@@ -92,8 +93,22 @@
             // TODO(b/251476085): migrate the legacy panel controller and simplify this
             view.repeatWhenAttached {
                 var currentSize: PromptSize? = null
+
                 lifecycleScope.launch {
-                    viewModel.size.collect { size ->
+                    /**
+                     * View is only set visible in BiometricViewSizeBinder once PromptSize is
+                     * determined that accounts for iconView size, to prevent prompt resizing being
+                     * visible to the user.
+                     *
+                     * TODO(b/288175072): May be able to remove isIconViewLoaded once constraint
+                     *   layout is implemented
+                     */
+                    combine(viewModel.isIconViewLoaded, viewModel.size, ::Pair).collect {
+                        (isIconViewLoaded, size) ->
+                        if (!isIconViewLoaded) {
+                            return@collect
+                        }
+
                         // prepare for animated size transitions
                         for (v in viewsToHideWhenSmall) {
                             v.showTextOrHide(forceHide = size.isSmall)
@@ -196,8 +211,9 @@
                                     }
                                 }
                             }
-
                             currentSize = size
+                            view.visibility = View.VISIBLE
+                            viewModel.setIsIconViewLoaded(false)
                             notifyAccessibilityChanged()
                         }
                     }
diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/ui/viewmodel/PromptViewModel.kt b/packages/SystemUI/src/com/android/systemui/biometrics/ui/viewmodel/PromptViewModel.kt
index 6d0a58e..d899827e 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/ui/viewmodel/PromptViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/ui/viewmodel/PromptViewModel.kt
@@ -192,6 +192,28 @@
     val iconViewModel: PromptIconViewModel =
         PromptIconViewModel(this, displayStateInteractor, promptSelectorInteractor)
 
+    private val _isIconViewLoaded = MutableStateFlow(false)
+
+    /**
+     * For prompts with an iconView, false until the prompt's iconView animation has been loaded in
+     * the view, otherwise true by default. Used for BiometricViewSizeBinder to wait for the icon
+     * asset to be loaded before determining the prompt size.
+     */
+    val isIconViewLoaded: Flow<Boolean> =
+        combine(credentialKind, _isIconViewLoaded.asStateFlow()) { credentialKind, isIconViewLoaded
+            ->
+            if (credentialKind is PromptKind.Biometric) {
+                isIconViewLoaded
+            } else {
+                true
+            }
+        }
+
+    // Sets whether the prompt's iconView animation has been loaded in the view yet.
+    fun setIsIconViewLoaded(iconViewLoaded: Boolean) {
+        _isIconViewLoaded.value = iconViewLoaded
+    }
+
     /** Padding for prompt UI elements */
     val promptPadding: Flow<Rect> =
         combine(size, displayStateInteractor.currentRotation) { size, rotation ->