Harry Potter star Scarlett Byrne welcomes first child with Cooper Hefner

Actress Scarlett Byrne has welcomed her first child with Cooper Hefner.

Byrne, 29, who played Pansy Parkinson in the Harry Potter movies, gave birth to a girl named Betsy Rose Hefner on August 24.

"At 5:23pm this afternoon Scarlett and I welcomed our daughter Betsy Rose Hefner into the world. We are overwhelmed with gratitude, love and joy," Hefner, 28, wrote on his Instagram account, alongside snaps of their newborn.

Hefner told E! News his daughter is named after his grandmother Betsy Aldridge-Conrad, who died in July this year. "Scarlett and I are filled with such joy," Hefner told the outlet. "We couldn't be happier."

In November last year, the pair got married in a civil ceremony in Los Angeles. They were engaged in August 2015 while in London.

"Cooper and I are excited to share that we legally married," Byrne wrote to accompany photos taken outside the courthouse. "We are looking forward to planning our wedding in the coming months where we will celebrate further with our friends and family.

"I love you Cooper. I am proud to stand by your side, as your partner, your friend, and your wife. I cannot wait to continue building a life together. My heart is so full and I am so grateful for our love."

READ MORE: Hugh Hefner's son Cooper Hefner marries actress Scarlett Byrne

Hefner spent may years working for his late father Hugh Hefner's Playboy empire (Hugh Hefner died in September 2017), but eventually left to start his own media company. He's now planning to run as a Democrat for the California Senate in its 30th district.