Jessica appeared with her sister and Bronx's mum Ashlee Simpson on The Rachael Ray Show on Monday and said that the youngster is looking forward to welcoming his cousin.
"[Bronx] rubs my belly... He said he wants it to be a girl," Jessica told Rachael Ray.
The 'With You' singer also joked about her often intense pregnancy cravings, saying: "This week it's peanut butter and jelly sandwiches, toasted.
"And then, I'll put some salt on my hand like I'm taking a tequila shot and then take a bite of the sandwich."
Jessica is expected to give birth to her and fiancé Eric Johnson's first child in early 2012. The couple have apparently selected several possible baby names.
Also during her appearance on The Rachael Ray Show, Jessica admitted that she cried when she first felt her baby move in her stomach.
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Watch Jessica Simpson's 'With You' music video below: