Luke Hemmings and Sierra Deaton made their sweetest collaboration to date.

The 5 Seconds of Summer singer and his wife announced that they privately welcomed their first child, a baby girl.

“Our best kept secret,” Luke and Sierra shared in an Aug. 22 joint Instagram post that included photos of their baby’s feet and hands, Sierra showing off her baby bump during a floral-themed maternity shoot and a video of Luke kissing his wife’s stomach. “Written and Produced by Sierra and Luke Hemmings.”

Luke, 29, and Sierra, 34, did not share any further details including their baby’s name or birthday. However, the “She Looks So Perfect” singer revealed why they decided to get ahead of the news.

“In our perfect world, we’d keep our daughter a secret forever…for similar reasons we chose

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