When is Jessica Simpson's due date? Hopefully soon! The pretty blonde singer said in a recent interview with Us Weekly that she feels like a big blob.

The heavily pregnant singer and fashion mogul said that she is looking forward to the premiere of her new NBC show Fashion Star on March 13 and is excited to see her thinner frame.

I wasn't pregnant when we shot it. It will be amazing to see myself with a waistline, the 31-year-old said during a conference call with the magazine on Thursday. I'll be like a big blob sitting on the couch watching myself thin.

Simpson will mentor 14 contestants alongside Nicole Richie, John Varvatos and Elle Macpherson in developing their fashion collections.

Being pregnant has also inspired Jessica Simpson to further develop her own line with a maternity collection. Simpson wants to add the maternity line to the Jessica Simpson Collection, which currently includes clothing, handbags and shoes.

The point of launching a maternity line, for me, is to do something different, Simpson explained. I'm not buying any maternity clothes. I'm wearing all clothes that come in bigger sizes. I really want to make a maternity line that's comfortable, but really stylish for people, because I believe that we all deserve to feel good and look good.

Simpson is expecting her first child with fiancé Eric Johnson. And though she looks ready to pop, Simpson has not revealed an exact due date. In January, she hinted that she will give birth in the spring.

I feel great. The pregnancy's going great. I'm just waddling around now. We're not saying the due date but it's in the spring so it's coming. I do want to be surprised [on the gender but], we've gone through all different kinds of names but we're pretty much set on our name so we'll see what happens.

The singer has continued to wear as fashionable clothing as possible - opting for flowing maxi dresses, bold prints and sky-high heels.