The Barbie and Ken dolls that you see in Toy Story 3 are based on real-life figures released by Mattel in the 1980’s. Below are pictures of the toys and the commercials that were made to market the figures.

Barbie:

'Great Shape Barbie' from 1983

This is what Barbie looks like in Toy Story 3:

Barbie in Toy Story 3

Ken:

'Animal Lovin' Ken' from 1989

This is what Ken looks like in Toy Story 3:

Ken in Toy Story 3

This is just more evidence of the amount of research Pixar does during development of their films.