Kylie Jenner celebrates 'husband' Travis Scott's birthday with Avengers: Endgame party

Kylie Jenner celebrated her “husband” Travis Scott’s birthday early with an Avengers-themed party, complete with the couple dressed as Captain Marvel and Iron Man.

The loved-up duo, who share one-year-old daughter Stormi, marked the premiere of the hotly-anticipated Infinity War sequel Avengers: Endgame on Thursday.

Snaps and videos from Jenner’s sister Khloé Kardashian show a scrumptious chocolate cake with a mock-up superhero scene, complete with figurines of Scott, Jenner and Stormi.

The cake was backed by a blue board, reading “HAPPY BIRTHDAY HUSBAND” fuelling rumours that the pair have secretly tied the knot.

Khloé also showed off the impressive blue balloon arch spelling out the same message for Scott – who turns 27 on Tuesday – on her Instagram stories.

Reality star sister Kim also posted a video of the party, showing a big selection of sweets and chocolate as well as the cake.

Jenner didn’t share anything from inside the family bash, but she did delight fans with snaps of them all ready to go in their costumes.

The 21-year-old, channelled her inner Brie Larson as she imitated Captain Marvel’s attire while Scott wore the famous Iron Man suit.

“Oh you didn’t catch iron flame and captain lip kit in the credits?” Jenner joked in the Instagram caption. “Sucks 4 you.”

Another shot wished everyone a “happy end game” as they cuddled up with their daughter.

Jenner has long fuelled speculation that she has married her rapper boyfriend, telling fans in January that she “missed her husband”.

The make-up mogul shares a sultry snap from a recent photoshoot with the Spanish caption: “Extraño a mi esposo”, which translates as, “I miss my husband.”

Jenner also frequently dubs Scott her “hubby” as she shares snippets of their life together on social media.