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OTRC: Jessica Simpson poses with son Ace and daughter Maxwell (Photo)

Jessica Simpson appears photo from her March 6, 2013, appearance on 'Jimmy Kimmel Live.' / Simpson appears on the Sept. 9, 2013, cover of Us Weekly with son Ace and daughter Maxwell Drew. (ABC / Randy Holmes / Us Weekly)

Jessica Simpson is showing her 2-month-old baby boy Ace to the world.

The singer and fashion mogul appears on the cover of the Sept. 9 issue of Us Weekly (see above) with her son and her 15-month-old daughter Maxwell Drew. Simpson posed with her children and fiance Eric Johnson for the magazine at their home in Hidden Hills, California on Aug. 12.

Simpson told the magazine she feels "very at peace with being a mom" and gave birth to Ace via a planned C-section on June 30.

The 33-year-old also said she's happy with just her two kids for right now.

"Pregnancy is a lot. It was hard to do two so close together," Simpson said. "I have this huge sense of accomplishment, and I feel in my heart that I'm done. But obviously, accidents do happen!"

Simpson, who posted her own photo of daughter Maxwell holding a blanket on Aug. 17, previously admitted during her appearance on "Jimmy Kimmel Live" in March that her pregnancy with Ace had been ittle tougher than her pregnancy with Maxwell.

"Oh my gosh, it's a total different pregnancy, I just feel awful - I've been vomiting," Simpson explained to Kimmel. "The crazy thing is, I never knew a wiener could make me nauseous," she laughed.

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