For me,the prettiest in SNSD/Girls Generation member in Mr.Mr Music Video is Tiffany Hwang (Hwang Mi Young) because she really looks great on it and her beauty mark really fits her and makes her more attractive! :) .

Sooyoung, esp the bridge part link

Taeyeon for closeups. She really looks so lovely and gorgeous especially the "Wooooh˜ Woah!"
Yuri fits the black & white concept. She also looks good in the close ups.
Jessica looks pretty all the way but Taeyeon's closeup just overpowered her.
Hyoyeon for close-ups and in the Womanizer.

Yoona for close-up and not much noticeable in Black & White.
Sooyoung almost looks pretty except for the hospital. But the light blocks her looks.
Seohyun in the last part and the Black and White. She kinda looks scary in the rest.

Tiffany's closeup was good but some parts I though of her as an elf (Please no bashes). She kinda looks older too. And her bangs and Womanizer are the worst. I can't see her much in the last one.

Sunny has been looked bad through this one. The long curly hair doesn't suit her. Close-up is pretty bad. She looks not bad in the Womanizer. The bangs really doesn't suit her. Where is she in the last one?

Sunny looked the best, cute and mysterious. Sooyoung, Taeyeon and Seohyun were great too.
Tiffany and Yoona were okay.
Yuri and Hyo looked mehhh.
Jessica looks the absolute worst. Her face shows clear signs of heavy plastic surgery.

Taeyeon

^^

Taeyeon/Jessica/Yuri

Soo

For me,Tiffany is the loveliest in Mr.Mr music video.

In the mr mr music video Fany looked so beautiful