Taylor Swift is one proud big sister. The singing superstar took to Instagram,…where, can we just point out she is thee most followed person with over 45 million followers…to post a picture of her brother Austin. Captioning the shot: 'My brother just acted in his first movie and I'm all proud and stuff.' The 23-year-old, who recently graduated from Notre Dame University, is believed to be staring in a revenge thriller called I.T. With his super star big sis promoting him like this we're sure he'll be a huge success.