Victoria and David Beckham's son Brooklyn is officially engaged to his girlfriend Nicola Peltz, and the engagement ring with which he popped the question is truly jaw-dropping.SEE: Victoria Beckham confirms son Brooklyn is engaged with beautiful messageWATCH: Brooklyn Beckham gets engaged to Nicola PeltzBrooklyn gave fans a close-up of the ring in a photo on Instagram, showing off an enormous rock which is estimated to feature a 4.5-5 carat diamond.