"There's this thing where, as a new mother, you're just constantly going, 'Am I doing this right?'" admitted our October cover girl Katherine Heigl, who adopted her 20-month-old daughter, Nancy Leigh Mi-Eun (Naleigh), with husband Josh Kelley last September. But despite her early self-doubt, the actress clearly is doing it right, balancing family and a successful career—Heigl's new film Life As We Know It, which she also executive produced, hits theaters October 8th. Heigl also opened up to us about adoption: "I had spoken to [Josh] about it before we got engaged and because I wanted to make sure we were on the same page—not everybody feels the way I do about adoption," she said. "I don't know why I felt like it was so important for me to do it before we had biological children, but I felt like I had been waiting and dreaming about Naleigh for a long time." For more on our exclusive interview with Heigl (plus what items she never leaves home without) check out the October Issue of InStyle, on newsstands Friday.