The British beauty - who is in a relationship with Arctic Monkeys singer Alex Turner - is unsure whether she wants to have children because she doesn`t find young people very interesting.
Asked about children, she said: "Hmm, I dunno about that. They`re a little boring, aren`t they?"
Alexa also admitted she is unsure whether she wants to get married because going to so many red carpet events have felt like she has already had multiple wedding days.
She said: "I don`t know. I feel like I`ve had my wedding day so many times, getting all dressed up for all these events. That time I dressed up for the Met Ball in New York in Phillip Lim was seriously one of the best nights of my life."
Despite feeling like she dresses up often, the 27-year-old MTV presenter admitted she loves wearing a tuxedo in place of an evening gown.
She added to Vogue magazine: "Evening gowns can be quite aging, so I often wear a tuxedo.
"When I go to an event I like to think there`ll be a less glitzy after-party, so I try to look as if I`m hanging out rather than going on show. I go to Carven, Phillip Lim and Yves Saint Laurent."