ABC News' Mary Pflum reports:

While expectant father Prince William spent the weekend attending a wedding with his brother, Prince Harry, William's pregnant wife was home getting ready for the arrival of the newest heir to the British throne.

Kate Middleton, 31, the Duchess of Cambridge, is due to give birth in mid-July to her first child.

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The stylish duchess made her last official pre-baby appearances last week, and as the world awaits the birth of the baby, many are now wondering how his - or her - nursery will look.

Victoria Murphy, ABC News' royals contributor, shared her insight, saying the duchess's decorating style is very similar to her style of dress.

"She likes very classic … very simple things, very elegant," Murphy said.

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The duchess is reportedly preparing two nurseries - one at their newly renovated apartment at 300-year-old Kensington Palace, and another at her parents' estate in the small English community of Bucklebury. That's where the duchess is expected to spend time with her mother, Carole Middleton, following the baby's birth.

Items in the royal nursery will include a Moses basket. The duchess and her mother were recently seen loading a basket, which retails for $450, into a car.

The mother-to-be has also been seen shopping at chic London boutiques for throw pillows, rugs and drapes.

While the duchess has been seen purchasing some upscale items, royal watchers say people shouldn't expect her to go overboard investing in ostentatious baby bling.

"She does like a bargain, we know that she's haggled for antique things in markets. We know that she visits outlet stores," Murphy said.

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The duchess has, however, made one modern investment: She's reportedly purchased a Bugaboo chameleon stroller in jewel blue with stylish stripes. It's considered a unisex design, which is perfect for the soon-to-be-parents, who've opted not to learn the baby's gender in advance. The stroller Kate picked out is believed to have cost $1,800.

Managers at Giggle, the baby store to the stars, say they expect what they're now calling "the Kate stroller" to sell out quickly.

"The colors she picks, the items in the nursery, they're all going to be hot ticket items," said Jackie Courlas, the sales captain at Giggle.

"GMA" spoke to mothers who agree.

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Said one woman of the duchess: "She's got fantastic taste. She's dressed so well throughout this pregnancy."

Added another woman: "I think everybody will be looking to see what she will get. I will for sure."