Duchess Kate and little sister Pippa reportedly want to get 'pregnant at the same time'

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Baby fever has reportedly hit the Middleton sisters!

Soon after giving birth to Princess Charlotte in 2015, Duchess Kate wanted to try for baby No. 3 right away, but it just wasn't the right time. 

“She wanted another almost since giving birth," a sourced revealed to Us Weekly

But between two little ones, Prince George and Princess Charlotte, and the their royal duties, it just wasn't the right time for Kate and hubby Prince William to add to the brood. 

"They promised each other they wouldn’t even think about having another child until they were mentally ready and it felt right," the source added.

Well ... according to sources, the time is now

"They would love to be pregnant soon," the insider said of Kate and William.

Coincidentally, Kate's sister, Pippa, is looking to start her own family just three months after her wedding to billionaire James Matthews. After all, their neice or nephew will need a playmate!

One insider revealed the brunette beauty and her hedge fund manager husband are "are currently trying for a baby."

The insider added: "Starting a family is something they’ve spoken about since long before they got married."

RELATE: Photos from Pippa Middleton's wedding day:

If Pippa and Kate did get pregnant around the same time, they can live out one of their biggest fantasies.

“It’s long been a dream for Kate and Pippa to be pregnant at the same time,” another Middleton family friend noted. “To share that would be amazing.”

Because of Kate and William's recent move to London, having babies around the same time has turned into an even more enticing idea for the tight-knight sisters. Between shopping for baby clothes and pregnancy yoga classes, it sounds like these two will have a blast -- and we definitely want to see photos! 

Princess Kate has proven time and time again how great she is with her two adorable tykes Charlotte and George. Do you remembered when calmed down a sweet Princess Charlotte during a tantrum? Or when she turned Prince George's frown upside down in Poland? It sounds like Pippa can lean on her big sister when it comes to parenting advice!