According to Sister Khloe's blog, Kendall was approached a few days ago by the owner of Wilhelmina Modeling Agency to come in for a meeting and they ended up signing her as a teen model! Congrats to little Kendall, she's only 13 years old but she very slender and is already 5'9! She also very cute!According to Sister Khloe's blog, Kendall was approached a few days ago by the owner of Wilhelmina Modeling Agency to come in for a meeting and they ended up signing her as a teen model! Congrats to little Kendall, she's only 13 years old but she very slender and is already 5'9! She also very cute!