But like the rest of the world, Ellen saw the young pair attend the Vanity Fair post-Oscars party together, where they were caught sharing an innocent kiss and snapping pictures that smacked of a prom night photo op, as Dave Letterman astutely noted last week.
"He's like your little brother?" Ellen asked on Tuesday's show when Selena made a return appearance, according to People. "What do you have to say now?"
"I don't know. I don't know," the 18-year-old fumbled.
"You were trying to hide it still, right? But now you've made it public," DeGeneres pressed. "You went to the Vanity Fair [party together] and made me a fool," she joked.
A giggling Gomez insisted that she "really didn't," as Ellen continued to push her to admit something about their apparent relationship.
Finally, Selena offered, "He's just sweet." To which Ellen replied: "He's sweet as can be. But he's not like your little brother, is he? No, he's not. And he's a fantastic guy. You can't try to hide that forever ... A little brother is not someone you want to date."
Gomez acknowledged that "that would be weird," and in a show of support for whatever it is that's going on between the two, Ellen presented her guest with a gift -- a pillow emblazoned with a picture of Justin Bieber's face with a heart around it.