It’s been 25 years since Shania Twain burst onto the scene with her hit album “The Woman in Me,” followed by the even more popular “Come on Over,” which set records for a female artist and established Twain as one of the iconic musicians of her generation. In this week’s “Sunday Sitdown,” Willie Geist talks to the country star about her incredible journey from poverty to the top of the music world, including her latest residency in Las Vegas.