her legs need toning? the last thing her legs need are toning... her legs look amazing!!! =]
the reason i think you say that is just because of the lighting that the show had...
the first pic at lanvin that did show up did show her legs, well... weird...
Natasha's body is on the really slender side already (a bit too slender). Isn't that enough?

She has opened 5 shows so far right?
The Row
D&G
Dolce& Gabbana
Rick Owens
RM by Rouland Mouret
Am I right?

I didn't have to time to come on the forum for two weeks and I've missed so many things! Too many to comment on really.