United Kingdom, Aug. 23 -- 5 Seconds of Summer star Luke Hemmings has become a father for the first time.

The 29-year-old singer took to Instagram to share the news that he and his wife Sierra Deaton had secretly welcomed a daughter together.

They captioned the post, which featured blurry photos of the baby: "Our best kept secret. Written and Produced by Sierra and Luke Hemmings."

Luke explained why the couple - who are thought to have married in 2022 - had chosen to keep their happy news a secret in the comments.

He said: "In our perfect world, we'd keep our daughter a secret forever... for similar reasons we chose to never share our wedding photos from years ago.

"However, going into this next album cycle I'm very aware that her ex...