Kylie's appearance at this year's Gala, themed “Heavenly Bodies: Fashion and the Catholic Imagination", marks her first since welcoming her daughter Stormi three months ago.
The 20-year-old wore a black velvet Alexander Wang gown with mini sunglasses.
It is also the first time the Keeping Up With The Kardashians star has walked a red carpet since giving birth.
Big sister Kendall Jenner hit the red carpet earlier in the evening in a fitted white jumpsuit. To see her look and the full red carpet gallery click here.