WATCH: Justin Bieber Raves About Selena Gomez's "Kissable Cheeks"

The pop superstar tells Ellen DeGeneres why he feels compelled to kiss his girlfriend so often in public

Have you ever wondered why there are so many pictures of Justin Bieber and girlfriend Selena Gomez kissing in public? Ellen DeGeneres has. And so, when Ellen had the 17-year-old pop superstar on her show Tuesday, she didn't hesitate to ask (and we're paraphrasing here): What's the deal with all the public smoochin', Biebs? Watch the video below for young Justin's "awww"-inducing response!

"Speaking of mistletoe, it seems that you and Selena find mistletoe everywhere you go," Ellen said -- using talk of Biebs' Christmas album Under the Mistletoe (in stores now) to not-so-subtly segue onto the topic of PDA. "You're kissing on her all the time. That's so sweet. You're just crazy in love, aren't you?" Ellen continued, as a highlight reel displayed numerous photos of Biebs planting kisses on his 19-year-old best girl.

"She has very kissable cheeks," Bieber replied, smiling shyly. "I feel like it's like I only live once, and it sucks to always have to hide it. So I just kind of do me, I guess."

If there were any women out there who weren't already head-over-heels for the affable Biebs, this display of romantic honesty should remedy that.

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