Prom dresses are a lot different ... and a lot shorter than they used to be!

Kendall Jenner, 16, and sister Kylie, 14, had a photo shoot yesterday for Sherri Hill -- a prom dress designer Kendall has done modeling and runway work for in the past.

Kim Kardashian's half-sisters both went glam for the L.A. shoot -- where they showed off a number of gowns ranging from short and sparkly to long and dramatic.

Check out more photos from the shoot above. Do you think the dresses are a little too much for 14 and 16-year-olds ... or is it just a sign of the times?

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