Hugh Hefner's son is engaged to Harry Potter actress and her diamond ring is HUGE

The Playboy founder's son Cooper popped the question while on a trip to London this week
Hugh Hefner's son Cooper is set to tie the knot with Harry Potter actress Scarlett Byrne.
The 23-year-old film producer, whose mum is Hef's second wife Kimberley Conrad, popped the question to the British beauty on Thursday in London.
He jetted to her birthplace to ask her dad for her hand in marriage and presented her a MASSIVE yellow diamond ring.
Scarlett played Pansy Parkinson in the Harry Potter franchise and we imagine the Playboy mansion will be a LOT different to her time at Hogwarts. See pics after the cut........

The 24-year-old beauty agreed to marry the Playboy boss's son and they celebrated at The Ritz Hotel with family.

In photographs on Instagram, she can be seen showing off her rock and having dinner with her husband-to-be.

Wearing a tight pink dress, the bride-to-be held his hand while sat with family at the Ritz and he captioned the snap: "Tea Time at the Ritz with the Grandmas #London."

He also wrote next to a collage of his beautiful other half: "To many more adventures with this lovely lady @scarleybyrne."

Cooper's famous father tweeted the happy couple congratulations, writing: "Sending love and congratulations to my son Cooper and his fiancée Scarlett on their engagement!"