Beckham household on Tuesday as Romeo Beckham celebrated his 18th birthday with his loved ones.GALLERY: David and Victoria Beckham's love story in picturesTo mark the milestone, doting parents David and Victoria treated their second eldest child to the cake of dreams - a gorgeous rainbow-tiered birthday cake, with layers of buttercream.WATCH: Victoria and David Beckham celebrate Romeo's 18th with unseen family photos"Happy birthday @romeobeckham X kisses on your birthday!! Love you so much