During Stern's appearance on Monday’s Late Show, he revealed to the audience that Letterman had invited the night's other guest, legendary comic Don Rickles, out to dinner, but hadn't invited Stern.
"Do you think I was invited? I wasn't invited. Terrible!" Stern said, standing in front of his desk. Before Letterman, 68, could defend himself, Stern asked the host to follow him to the middle of the stage.
Nervously, Letterman walked into the spotlight with 61-year-old radio host, who began to grab the host's jacket lapels.
"What are you gonna do?" Letterman asked, trying to back away.
"Come here and hug me," Stern said, pulling him in close. They held their embrace for a moment before Stern went in for the lip lock.
"Kiss me!" Stern yelled over Letterman's cries of dismay.
It might have been slightly awkward, but it was also super adorable. Two good friends saying their goodbyes in the insane manner you'd expect from the legendary hosts.