Kate Middleton takes up yoga

Kate Middleton -- who's expecting her first child with husband Prince William -- has taken up yoga

"Kate has a yoga instructor visit her at the palace," a source said.

"She's been reading as much as possible, from how to be a good parent to how to stay healthy for the baby."

Kate has reportedly receiving deliveries from Amazon on a daily basis.

"It's probably her favorite shop in the world," the source adds. "She buys a lot!

"She's got sugar on the brain. Chocolates, biscuits, cake." When she sneaks off to a nearby Starbucks for a decaf coffee, she'll often pick up a baked good!"