Three weeks after Prince William and Kate Middleton returned from their official visit to Canada, the royal couple has exciting baby news!

Life & Style has exclusively learned that the brunette beauty is pregnant with the duo's third child, and that sister Pippa Middleton is planning her upcoming nuptials around the birth.

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"Pippa desperately wants the focus to be on her rather than her sister's bump," a source shares of the 33-year-old, who recently got engaged to hedge fund manager James Matthews.

pippa middleton kate middleton getty images

Kate and Pippa at the royal wedding in 2011.

"She may put off the wedding until Kate has had her baby," a friend adds. "Pippa is planning things around Kate."

For more royal baby news, pick up the latest issue of Life & Style, on newsstands now. And scroll through the gallery below for a look back at Kate’s best maternity style!