Chappell Roan made a lot of headlines Sunday night when she walked the Grammys red carpet with her boobs on full display ... and today she claims to be surprised by the attention! In case you missed them ... CR wore a sexy and risqué sheer red dress for the cameras on her way in to the show ... and it got noticed big time -- because, duh! Then on Monday, the singer-songwriter claimed to be taken aback by all the attention ... posting on IG she was "giggling" because it was not "even THAT