How do I put a border around an image in WPF?

Question

I have a StackPanel containing five images and I want to put a black border around each image.

The XAML I have at the moment is:

Answer 1

Simply wrap the Image in a Border control

You could also provide a style you apply to images that does this if you don't want to do it around every image

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Final solution from answer and comments added by Pax: