Jessica Simpson: "I Can't Wait to Meet My Baby!"

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Now that her secret is out, Jessica Simpson can't help but gush about the baby she's expecting with fiance Eric Johnson.

"We're both thrilled," the 31-year-old singer tells the new issue of Us Weekly (out now). "We can't wait to meet our baby!"

According to a Simpson pal, the first-time mom-to-be is "very, very excited about the pregnancy. Family is really the most important thing to her."

Luckily, Simpson hasn't suffered from any morning sickness, though she has been "really tired lately," a pal tells Us. "She goes to bed super early now and gets up at 5:30 in the morning."

Not that Simpson is slowing down. Along with her upcoming NBC reality show, Fashion Star, and a shoe and clothing empire worth nearly $1 billion, Simpson just launched her skincare system, BeautyMint, and is working with Zales on a jewelry line.

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"The craziest thing is, she's still taking all her meetings -- in heels!" jokes another confidante.

For more on Simpson's pregnancy news -- including how Johnson, 32, has become "very" protective of his expectant bride-to-be, what her sister Ashlee thinks of becoming an aunt, and much more -- pick up the new issue of Us Weekly, out now!