Brooklyn wrote: "Two weeks ago I asked my soulmate to marry me and she said yes".
The couple have been dating for about seven months and today's announcement comes after reports that Brooklyn had received the blessing from his mum and dad, David and Victoria, to ask Nicola, 25, to marry. "I love you baby xx". She wrote, "You've made me the luckiest girl in the world".
He made his romance with Nicola Instagram official in January days before celebrating her birthday. "I can't wait to spend the rest of my life by your side", the actress wrote.
Victoria posted the same photo Brooklyn shared to announce his engagement, writing that this was "the MOST exciting news". "I love you baby xx".
A second said: "I thought that was his mother, she looks just like her". We could not be happier.
Brooklyn commented on her post: "My girl forever, I love you more than anything".
Brooklyn Beckham and Nicola Peltz are engaged
Although Victoria hasn't commented on the ring choice yet, she did send the happy pair her best wishes in a lovely message.
The picture taken of the young couple is said to be shot by Brooklyn's younger sister Harper, nine.
He wrote: "Congratulations", followed by a red love heart.
Brooklyn's brothers Romeo and Cruz also congratulated Brooklyn and their future sister-in-law.
Brooklyn and Nicola recently reunited with his family after being in lockdown in the United States.
The happy couple have been isolating together in NY since March.
One person said: "Now this made me smile! congrats you lovely people".