Check out Steve Martin's must-see backstage selfies with David Letterman

As we know, David Letterman briefly unretired on Friday night to deliver a very funny top-10 list mocking Donald Trump.

Letterman's appearance came at a Steve Martin/Martin Short show in San Antonio, Texas. Now Steve Martin has tweeted two great backstage photos -- one selfie of the group, and one shot of Letterman and Short.

Check them out below.

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And watch the entire Letterman appearance here.