Surprise: Luke Hemmings is a dad! On Friday (Aug. 22), the 5 Seconds of Summer frontman revealed that he and his wife, musician Sierra Deaton, recently welcomed a baby girl without the world knowing.

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Sharing a hazy photo of his newborn daughter’s tiny hands, as well as an older snap of a then-pregnant Deaton posing with Hemmings cradling her baby bump, the rocker wrote on Instagram, “Our best kept secret … Written and Produced by Sierra and Luke Hemmings.”

In the comments, Hemmings opened up about his choice to share the news with fans now a

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