Congrats to Scarlett Byrne and Cooper Hefner!

Hefner, who is the son of legendary Playboy founder Hugh Hefner, shared the good news that they're engaged earlier this week.

"To many more adventures with this lovely lady ," Cooper wrote on Twitter along with a collage of photos, including one that showed off the 24-year-old's sparkling new engagement ring.

Byrne, who played Pansy Parkinson in the last three "Harry Potter" movies and appeared on the "The Vampire Diaries" this past season, also celebrated the couple's news on social media. "I was lucky enough to fall in love with my best friend," she wrote.

The couple aren't the only one's celebrating, as Cooper's father congratulated the couple on their engagement on Twitter, as well.

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