Miley Cyrus, 29, brought out a very special guest for her NBC event βMileyβs New Yearβs Eve Partyβ on Friday night. During the celebration, which was held in Miami, Florida, Cyrus surprised the crowd by introducing her sister, Noah Cyrus, 21. The two walked hand in hand onto the stage as Miley Cyrus shouted, βWelcome to the stage my baby sister!” Noah and Miley Cyrus then began belting along to Dolly Partonβs heart-breaking classic βJolene.β Half-way through the performance, Noah Cyrus gave her sister a kiss on the cheek. The siblings also lovingly sang a few of the lyrics to each other. Fans seemed to really love the sibling duet. βThis is probably the best that Miley has ever sounded. Her and her sisters harmonies are spot on,” one person commented on YouTube. Another fan wrote, βMiley and Noahβs voices together are POWERFUL.” Noah and Cyrus both rocked glamorous ensembles for their impressive duet. Noah Cyrus wowed in a high-slit, cut-out black dress. She completed the look with matching black gloves. The βMidnight Skyβ singer wore a shimmery silver jumpsuit as one of her many outfits throughout the night. Miley Cyrus has frequently covered the track by Parton, 75, who is her godmother.