"He did?" Letterman asked. "To?"
"I don't know," Jennifer responded.
While Jennifer didn't have David's fiance, 24-year-old photographer Zoe Buckman on her lips, Letterman suggested Jennifer should still share her former co-star's news online.
"You know what you should do, you should totally Tweet that," Letterman laughed.
"I don't Tweet. Do you Tweet?" Jennifer asked the late night host.
"I don't have a machine. I don't know how to do it," he said.
Jennifer also opened up about her redesigned, 10,000 square foot Los Angeles home, which she described as, "sexy, comfortable."
"What do you call yours?" Jen asked of Letterman's pad.
"A place to store rakes," he responded.
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