Heidi and Spencer Do Letterman

What's the world coming to when Heidi Montag and Spencer Pratt are considered talent? For the life of me, I still can't seem to accept that these two are actually celebrities. Why?? Why are they celebrities??

Speidi made an appearance on the Late Show with David Letterman last night, but not before making out for the paps outside the Ed Sullivan Theatre. They shared the spotlight with Matthew Broderick, who is an actual celebrity. Here's a clip of Heidi on the show...