"She's Rosalicious."
( ͡° ͜ʖ ͡°)
Also the fact that he is yet another person who views her as a princess means he literally bumped her down a few spots. Realising she is a goddess/fourth dimensional being (as I've heard suggested)/"SOMETHING SOMETHING THAT'S LUDICROUSLY POWERFUL WITH MANY POWERS INCLUDING THE GOOD OL', RATHER HILARIOUS HAVING A LITERAL UNIVERSE IN HER GOWN" makes her a ton more sexy in my book than if she were just another run of the mill princess.
Also it surprises me that people never bring up Rosalina's shoulders and neck when talking about her in these kinds of YouTube videos. And the fact she probably doesn't wear a bra at all.
I mean it's surprising they don't bring up a lot of things, but those things specifically. Seriously, I have never been so particularly drawn to those areas of a woman's body, but something about Rosalina's neck/shoulder area just looks like pure perfection.