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Scotty McCreery  is perfecting his duck call! The 19-year-old Season 10  American Idol winner made a special appearance at  Duck Dynasty  star  Willie Robertson 's daughter Sadie's  Sweet 16 birthday party  on June 17. McCreery sang a duet with Willie, and serenaded the birthday girl during the bash. Sadie tells  Us Weekly that she "freaked out" over McCreery's appearance, and even cajoled him to dance the two-step with her. "He doesn't usually dance!" she marveled. PHOTOS:  American Idol  winners Willie and his wife  Korie  threw their daughter the over-the-top soiree -- complete with a "Redneck Red Carpet" -- in West Monroe, La. "It felt like a party for everyone!" Korie told Us. The 200 invited guests enjoyed lobster corn dogs and decorations selected by HGTV's  Junk Gypsies . PHOTOS: Hollywood's bearded men "Great time out at Sadie's bday party!" McCreery  tweeted  after the party