Miley Cyrus ' latest batch of wild Instagram videos have us saying, "Turn down for what?!" The 21-year-old "We Can't Stop" singer shared some wacky, high-energy clips of herself rapping while on an airplane yesterday. In one video captioned "#ayturnup #pjnotinmypjs," Cyrus raps and rhymes before busting some dance moves. In a second clip, Cyrus shakes her head and arms around while twerking along to the hip-hop jam. Cyrus also shows off her rap skills in a third video. Cyrus' new videos prove she's clearly not letting the break in at her home over the weekend get her down.