Kate Hudson doesn’t often cry when she screens her own movies — she’s too busy critiquing her work — but watching her latest film, “ Song Sung Blue ,” was an exception. She was sitting in a darkened room with her mom, Goldie Hawn, and her “pa,” Kurt Russell, Hawn’s longtime partner. Instead of nitpicking details of her performance opposite Hugh Jackman, Hudson found herself getting lost in the true story of two Milwaukee tip-jar performers whose love of music helped their blended family navigate life’s trials and tribulations.

“There were a lot of tears,” Hudson recalls of that screening. Russell compared the inspirational tale to the classic underdog movie “Rocky.” Hawn was a mess.

“There’s no frills in this movie,” Hudson says. “It’s not glamorous. And there are some shots where my

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