-- Justin Bieber isn't backing down from his claim that he's single.
"I'm not dating anyone," he said. "She's just a friend."
DeGeneres wasn't convinced, especially because Pierce was present when Bieber, 21, was snapped walking around their villa nude. ("I have friends, I've never seen them naked like that," she said, as he covered his eyes. "And they don't bring me to Bora Bora!") Later in the interview, talk turned to Bieber's ex, Selena Gomez. Bieber admitted three songs on his new album were inspired by their relationship: "What Do You Mean?," "Sorry," and "Mark My Words." He also hinted they might get back together someday.
"We have a lot of history together so it could possibly happen," he said. "I think we're both just on our own journeys, figuring ourselves out and once we've figured ourselves out we could maybe come together and make an awesome duo."
"I just want her to be happy, honestly," he said of Gomez.
DeGeneres will have plenty more time to pry into Bieber's love life in the coming days. The singer will be on the show all this week, leading up to the release of his new album, "Purpose," this Friday.