Kendall and Kylie at The Vow

No big sister escort any more! Kendall and Kylie Jenner are grown-up and elegant at The Vow premiere.

TV personalities Kendall Jenner and Kylie Jenner attend the premiere of Sony Pictures' 'The Vow' at Grauman's Chinese Theatre. (GETTY/GALLO)

TV personalities Kendall Jenner and Kylie Jenner attend the premiere of Sony Pictures' 'The Vow' at Grauman's Chinese Theatre. (GETTY/GALLO)

TV personalities Kendall Jenner and Kylie Jenner attend the premiere of Sony Pictures' 'The Vow' at Grauman's Chinese Theatre. (GETTY/GALLO)

TV personalities Kendall Jenner and Kylie Jenner attend the premiere of Sony Pictures' 'The Vow' at Grauman's Chinese Theatre. (GETTY/GALLO)

TV personalities Kendall Jenner and Kylie Jenner attend the premiere of Sony Pictures' 'The Vow' at Grauman's Chinese Theatre in Hollywood, California. (GETTY/GALLO)

TV personalities Kendall Jenner and Kylie Jenner attend the premiere of Sony Pictures' 'The Vow' at Grauman's Chinese Theatre in Hollywood, California. (GETTY/GALLO)

Reality TV stars (L-R) Khloe Kardasian, Kylie Jenner, Kris Kardashian, Kourtney Kardashian, Kim Kardashian, and Kendall Jenner arrive on the red carpet of the Kardashian Kollection Launch Party in Hollywood, California. (GETTY/GALLO)

(L-R) Television personalities Scott Disick, Robert Kardashian Jr. Kim Kardashian, Kourtney Kardashian, Khloe Kardashian, Kylie Jenner, Kris Jenner and Kendall Jenner arrive at the grand opening of the Kardashian Khaos store at the Mirage Hotel & Casino in Las Vegas, Nevada. (GETTY/GALLO)

Television personalities Kendall Jenner (L) and Kylie Jenner (shoes detail) arrive at the grand opening of the Kardashian Khaos store at the Mirage Hotel & Casino in Las Vegas, Nevada. (GETTY/GALLO)

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