Proud parents David and Victoria Beckham have paid tribute to their son Cruz on his 18th birthday.The budding musician was inundated with messages and Instagram posts, with a super sweet montage of clips posted by both his parents as he "finally" turned 18. David captioned the tribute: "Happy 18th Birthday to our baby boy," with a red heart emoji. "To the most amazing boy with the most amazing energy and the biggest heart x we are so proud of you and we love you so much Cruzie," with another heart emoji.