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"It was like a little prom night, wasn't it?" the "Who Says" singer replied when David Letterman whipped out a picture during her Late Show appearance Wednesday of her and Bieber looking cozy at the Vanity Fair Oscar party.

"So you're dating? Not dating?" Letterman asked the 18-year-old several times, unfortunately never giving her a chance to answer after the "So you're dating?" part.

"He's been in my life for so long, and it's just nice to have someone who understands what you're going through," Gomez said.

And who does she have to thank for that?

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"His manager called my mom, who's my manager," Gomez explained, setting the record straight for Dave.

"I thought he was your paperboy," the funnyman cracked.

That got quite the laugh out of the otherwise perfectly poised Gomez, who guessed correctly that she was starting to blush.