Scene2d TextButton square

Newbie & Debugging Questions
#1

How do I make my buttons square(1:1 ratio)

btn.clearChildren();
		Image image = new Image(new TextureRegionDrawable(new TextureRegion(
				texture)));
		btn.add(btn.getLabel()).padLeft(10).left().row();
		btn.add(description).padLeft(10).padTop(-10).left().row();
		btn.add(image).fill().expand();

I’ve tried setting the image’s dimensions to the bigger of the two (width/height)