Animating GUITexture scale

When you complete a level on my game I have a 3 star rating.

Lets say you get 3 stars. I have it so each star is rendered after 2 seconds. (one after the other).

What I wanted is so that the star appears larger and decreases in size. Something like from 120px to 75px.

I have tried this by setting the width and height of the star over a given time but this didn't work since it's being called from OnGUI.

I also thought about using a Plane and using that as the star texture but since this is being called in OnGUI I cannot just Instantiate the stars as it would create alot.

Does anyone have any ideas?

This is my current code:

 GUITimer -= Time.deltaTime;
        
         for (int s = 0; s < stars; s++) {
 
             Vector2 starOffset = new Vector2(25, 60);
            
             starOffset.x += s * 100;
 
             GUILayout.BeginArea(Helper.OffsetRect(-160, -220, 500, 150)); {
 
                 Vector2 size = new Vector2(115, 115);
                 if (size.x > 75) {
                     size.x -= Time.deltaTime;
                     size.y -= Time.deltaTime;
                    
                     Debug.Log (size.x);
                 }
 
                 if (s == 0) {
                     if (GUITimer <= 8f) {
                         GUI.DrawTexture(new Rect(0 + starOffset.x, 0 + starOffset.y, size.x, size.y), starTexture);
                     }
                 }
 
                 if (s == 1) {
                     if (GUITimer <= 6f) {
                         GUI.DrawTexture(new Rect(0 + starOffset.x, 0 + starOffset.y, size.x, size.y), starTexture);
                     }
                 }
 
                 if (s == 2) {
                     if (GUITimer <= 3f) {
                         GUI.DrawTexture(new Rect(0 + starOffset.x, 0 + starOffset.y, size.x, size.y), starTexture);
                     }
                 }
             }
             GUILayout.EndArea();
         }