Amber Portwood knows she has some challenging conversations ahead with her 13-year-old daughter, Leah. The star spoke with ET's Deidre Behar about the upcoming new season of the MTV reality series and how she will explain her highs and lows to her eldest child. «She's very smart, straight A student. I'm very proud of her,» Amber, 30, gushes to ET of Leah, whom she shares with ex Gary Shirley.