GREENFIELD, Wis. (WKOW) -- Actor Hugh Jackman made an unannounced visit to a Kopp's Frozen Custard near Milwaukee on Tuesday.

Wearing an apron and nametag, Jackman served a special flavor created to promote "Song Sung Blue," his upcoming movie about a Milwaukee Neil Diamond tribute band.

The featured custard, "Song Sung Blueberry," includes blueberry and cream cheese custard with a blueberry ribbon, pastry pieces and streusel crumble.

According to our Milwaukee affiliate , the film will premiere Tuesday at Milwaukee's Oriental Theatre. It tells the real-life love story of Mike and Claire Sardina, known onstage as "Lightning & Thunder." Jackman plays Mike, and Kate Hudson plays Claire.

"Song Sung Blue" opens in theaters nationwide on Christmas Day.

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