The iHeart Music Awards was a pretty good night for Taylor Swift. Not only did she win a bundle of awards, including best lyrics, song of the year and artist of the year. But she also got to jump on stage to perform with her idol Madonna. The pop princess grabbed her guitar and joined the queen of pop for a special performance of Madge's new single Ghost Town. Clearly feeling a little star struck Taylor took to Instagram to show off her evening with a series of snaps of her and the Material girl. Captioning one image #MyFanGirlLife.