Just to be clear, feminism isn't about not being attracted to beautiful women. It's perfectly human to admire someone's beautiful features, regardless of anyone's gender. Feminism is about respect, equality, rejecting prescribed roles and limitations placed on gender, and acknowledging and addressing privilege and patriarchal systems of society.
Notice none of those things means you can't still like the sight of boobs, butts, legs, abs, biceps, or whatever gets you excited. It does mean that you shouldn't reduce someone's value to those things, nor should your excitement about seeing someone's beautiful physical attributes become a problem for them, like if you harass them or catcall them over it, or worse.
But Emma is well respected, not only as an actress but as an advocate, and she's there to represent a great cause to the UN. They can respect her and her work and message and still think she's a knockout at the same time. They're not mutually exclusive, and that's a pretty relevant part of feminism, divorcing worth as a person from sexuality and attractiveness.