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Kylie Jenner threw boyfriend Travis an Avengers-themed birthday party on Thursday. 1 / 6

The rapper, who turns 28 on April 30, enjoyed a cake with 'Happy Birthday Husband!' written on it. 2 / 6

Several members of the Kardashian/Jenner clan attended the festivities, including Kim and Kanye,... 3 / 6

...as well as, Khloe, who showed up in a red cap and appeared to be flying solo for the evening. 4 / 6

Also on hand was the matriarch of the family, Kris Jenner, who arrived with a friend and a mysterious black box. 5 / 6