Brooklyn Beckham, 21, is having “zero doubts” about his engagement to his fiancee Nicola Peltz, 25, even after his ex-girlfriend Lexy Panterra, 30, made some shocking comments about how she thinks he’s “too immature” to get married because he “has a new chick every month.” “Brooklyn’s so happy right now, nothing can bring him down,” a source EXCLUSIVELY told HollywoodLife. “It’s a bummer that Lexi chose to speak badly about him but it won’t get to him.