i think it's pretty obvious that some of them did plastic surgery
but i choose Hyoyeon because she looks like a plastic barbie now, i hate it. what's up with her face? it looks like it's full of botox... i don't understand why koreans say she's pretty now...wth, i think she was prettier in ITNW. so unique and exotic. now she looks just like another korean...basic....and she needs to change her light blonde hair, it makes my eyes hurt. change it to caramel blonde, please...
it's so hard for me to like Hyoyeon in an MV, because her face constanly changes but i can't explain what it seems to change...i love her in ITNW, Time machine and that sub unit MV, but that's pretty much it....
Jessica/Seohyun would be my second choice
Yuri third

suddenly, she's hot

well, they couldn't debut if they don't do plastic surgery or at least that's what i think? anyway, from those pictures: Tiffany, Jessica and Hyoyeon~

Aside from the obvious choice of Hyoyeon, present day I think Taeyeon looks the most different. With her lips and nose, she doesn't look much alike her old debut look.

Jessica looks kinda different but her change was gradual, there are some differences

Sunny- I don't think she has changed much facially but I think with her having short hair, I see her face differently. She still looks the same

Tiffany- she doesn't look all that different from her debut days

Yuri- looks the same to me

Sooyoung- She looks kinda different but like Jessica it was gradual

Yoona- looks the same to me

Seohyun- looks the same to me

i thnk Taeyeon looks the same, tiagih, lol. in fact, the only members who look the same are Taeyeon and Sooyoung. i would say Seohyun is natural too but i was almost picking her because the difference in her eyes is HUGE...and she looks much more lady like now. but i know it's just makeup, Seohyun is most likely natural

4 me all changed except tae yoona yuri seohyun and may be soo

I agree with pretty_angel92, Taeyeon, Sooyoung and Yoona are the only members who have not changed, especially Taeyeon, and I think that has changed is Tiffany

i love Fany and Sica , but I think they changed more

Hyoyeon, Tiffany, and Jessica changed a lot
Sooyoung, Taeyeon, and Sunny changed but not as much
Yoona, Yuri, and Seohyun look prettier but still natural

I mean we can disagree but I think Taeyeon and Hyoyeon made the biggest changed

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I think Jessica changed the most. Yoona, Taeyeon, and Yuri look fine.

even though Jessica changed alot now, she looked prettier and hotter now XD (imo)

Hyoyeon or Tiffany. But I think Tiffany looks different because she is fat before debut. Hyoyeon,Tiffany and Yoona changed the most. Yuri,Sunny.Taeyeon and Sooyoung changed but not too much. Jessica and Seohyun looks same imo

Well I don't agree Jessica don't look the same...Tiffany also
They change the most

all expect yoona and yuri and seohyun

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and u can see this group pic with two other members two
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hyo ofc she did it
jessica full of it
tiffany oh yeah but not that much
taeyeon maybe the nose
and soo yes she did it her face

Tiffany definitely is the change more, really wonder the great change that had

Jessica! look at her pre debut pics :/

Obviously.

^agree with shiraz

when people grow up they changed a lot i could tell because i have many friends who have change radically...so i dont think they had surgeries...maybe yes or no...but thats the life some people changed and others still the same..