Madonna's oldest child, daughter Lourdes Leon, is becoming a star in her own right.READ: Madonna's daughter Lourdes Leon showcases dancer's figure in tiny crop topThe Holiday hitmaker couldn't be prouder of her firstborn and was one of the first to show her support for the 24-year-old after she announced some exciting news this week.Lourdes took to Instagram to share a rare post, revealing that she was one of the cover stars of Vogue magazine, and her famous mother was one of the first to like