The 20-year-old Lip Kit creator sported a black velvet Alexander Wang dress and mini sunglass as her 26-year-old R&B singer boyfriend stayed close to her side on the carpet.
The Met Gala marks the couple's first official red carpet and event since becoming parents in February.
The Life of Kylie star rapper also stepped out for a date night in New York before the gala. The Keeping Up with the Kardashians star was all smiles, showing off her post-baby body in a green jumpsuit on Sunday, May 6.
Kylie and Travis started dating in April 2017 after the reality star's split from Tyga. In September, the news that the duo was expecting their first child together come. On February 4, Kylie announced that she gave birth to a baby girl three days earlier.