Jessica Simpson, 39, is well aware that her ex John Mayer, 42, admitted he “heard bits” about how she wrote about their time together in her memoir Open Book, when he appeared on the Apr. 1 at-home episode of Watch What Happens Live but she’s not focusing on it. The singer expected him to make comments about it since her thoughts on their relationship is a juicy part of the new release, but it’s not something she’s focusing on.