The `Twilight Saga` star revealed he was at a party when he said "the most ridiculous thing" ever to the `Someone Like You` hitmaker, advising her to reach for her goals, and woke up the next morning regretting his words.
Speaking on Canada`s `George Stroumboulopoulos Tonight`, he explained: "Actually I had this argumentwithAdele, which is probably the most ridiculous thing I`ve ever said. I was saying, `You know, you can really just like reach for it,` and she was like, `You do realise I am like the biggest-selling female artist ever?`
"And I just for some reason just decided to get into an argumentwith her.
"I woke up the next day really regretting the whole thing."
Robert - who is dating his `Twilight Saga` co-star Kristen Stewart - also claimed his vast fame hasn`t stopped him from meeting new people because he isn`t very sociable anyway.
He said: "I`ve always been like this. I`m one of those people who is dying to go to the party and then when I get there I just hang out in the corner with the people I came with, not talking to anybody else anyway.
"I have this fantasy that if I wasn`t famous I`d be out meeting random people on the street but that`s not true. Most of the time you try to avoid random people on the street whether you`re famous or not."