Paris Hilton went on Letterman the other day... Maybe she shouldn't have, cause good ol' Dave offended her (ouch!).

At one point during the show, one of the audience members screamed: "I love you Paris!". Letterman replied;" Is that somebody you met in prison?!"..Obviously this had the audience screaming with laughter, but not Paris! She answered: "I didn't come here to talk about this. That was a long time ago. Now you're making me sad I came."

Awww... Good thing Letterman apologized and Paris was pouring again a second after...

Watch the clip from TMZ.com