Hugh Hefner's Son, Cooper Hefner, Is Engaged to The Vampire Diaries' Scarlett Byrne

Playboy legend congratulated his 23-year-old son on the happy news

Congratulations are in order for Cooper Hefner.

The 23-year-old son of Playboy founder Hugh Hefner is engaged to The Vampire Diaries actress Scarlett Byrne.

Cooper shared the exciting news on his Instagram, posting a photo collage with the caption, "To many more adventures with this lovely lady." In the celebratory photos, Byrne is peeking over Cooper's shoulder and showing off her new ring, the centerpiece of which is a gorgeous yellow diamond.

To many more adventures with this lovely lady @scarleybyrne

A photo posted by Cooper Hefner (@cooperbhefner) on Aug 4, 2015 at 5:11pm PDT

Byrne also shared the exciting news on her Instagram, writing, "I was lucky enough to fall in love with my best friend."

I was lucky enough to fall in love with my best friend. ??

A photo posted by scarlett (@scarleybyrne) on Aug 4, 2015 at 5:19pm PDT