Two weeks ago, Jessica Simpson finally confirmed that she is having her first baby with fiance Eric Johnson, and now the 31-year-old is dishing about her smooth pregnancy.

"I feel great, I honestly do," she says in a recent interview with 'Access Hollywood.' "Pregnancy is a friend of mine. Everything has been running smoothly. So far, so good. No morning sickness; I feel great. I'm tired, but I'm making a baby."

In the clip, the singer opens up about the changes in her body, citing the obvious -- her increased chest size. Interviewer Billy Bush does his best to keep his eyes locked on Simpson's.

As for how she found out about her little bundle of joy, the pop star reveals that she got the news by taking a home pregnancy test. "I was just feeling a little off, and before we went away for a weekend with some of our friends, I wanted to make sure I was in the clear to have a couple of glasses of champagne," she explains. "And I was not in the clear!"

Simpson admits that she and her soon-to-be hubby have not started decorating their nursery, but for a good reason. The couple doesn't know whether they're having a boy or a girl just yet.

Watch Jessica Simpson's Pregnancy Interview With 'Access Hollywood'