From her pop music, like her second studio album Irresistible (2001), to the country sound of her sixth Do You Know (2008), Jessica's been in the game for a minute; she's come a very long way. "I am a woman now and I can do what I want and to have freedom in music — I think that's what you're going to feel in Nashville Canyon."

"He's still very much a part of my life and will always be," the singer-songwriter tells PEOPLE Jessica Simpson’s first single, "Use My Heart Against Me," drops from her new EP: Nashville Canyon: Part 1 - this week — just a month after announcing the end of her 10-year marriage to Eric Johnson,