“Harry Potter” star Scarlett Byrne has had twin daughters with her husband and Playboy founder Hugh Hefner’s son Cooper.

The English actress, who played Slytherin student Pansy Parkinson in the wizarding films, said her heart had “grown twice” after giving birth on Saturday.

Byrne shared a photo of herself holding the new arrivals in the hospital and revealed their names to her 412,000 Instagram followers.

She wrote: “My heart grew twice as much this weekend as Cooper and I welcomed our daughters, Marigold Adele Hefner and Blossom Pearl Hefner into the world.

“Our home with our three daughters is full of love and we couldn’t be happier.”

Hefner added in a post on Twitter: “Scarlett and I are overjoyed to announce that on Saturday March 26th we welcomed Marigold Adele Hefner and Blossom Pearl Hefner into the world.

“Today we are home again. How blessed we are to have been given her life. How lucky we are to have this love.”

The couple already has a 19-month-old daughter, Betsy Rose.

Byrne reportedly became engaged to Hefner in August 2015.

Among those offering congratulations was actress Ellie Darcey-Alden, who played the young Lily Potter in the Harry Potter films.

She wrote: “So proud of you Scarlett! These girls are so lucky to have you.”

Byrne made her debut in the Potter series in the sixth installment, “Harry Potter and the Half-Blood Prince,” and reprised the role in the final two films in the series.

Her character mocked and teased Harry and his friends and was later appointed Slytherin prefect along with Draco Malfoy.