When SELENA GOMEZ was on "The Ellen DeGeneres Show" last September, Ellen tried to press her about her relationship with JUSTIN BIEBER.  And Selena told her, quote, "He's little.  He's like my little brother.  That's weird to me."

--Well, Selena can't deny the relationship anymore.  So when she returned to "Ellen" yesterday, Ellen put her on the spot . . .