Beat butter, orange zest, and lemon zest at medium speed with an electric mixer 1 to 2 minutes or until creamy; gradually add powdered sugar alternately with lemon juice and 5 Tbsp. fresh orange juice, beating at low speed until blended after each addition. Add up to 1 Tbsp. additional fresh orange juice, 1 tsp. at a time, until desired consistency is reached.
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