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Pippa Middleton

Vantagenews/AKM-GSI

Look, commoners: It's Kate Middleton's baby—her baby sister, that is.

Pippa Middleton was spotted out and about in London Wednesday, doing a bit of shopping in the rain while she (and the rest of the world) waited for royal baby No. 2 to arrive! 

The 31-year-old party planner didn't appear to be bothered by the dreary weather—for one thing, she's British, and another? She was prepared for a slight sprinkle, so when the rain came down, she simply pulled her jacket's hood up over her head, her brunette blowout remaining dry and frizz-free.

Even if she had been unprepared for inclement weather, Pippa wouldn't have let a little precipitation ruin her day. After all, she's gearing up to be an auntie again any day now when big sis Kate, 33, gives birth to a little prince or princess!

When, exactly, are we thinking Prince George is going to have a baby brother or sister? Well, last month, Kate revealed she was expecting baby No. 2 to arrive by the "mid-to-end of April." Seeing as we're almost to the month of May, though, that's seeming less and less likely.

Do keep in mind, though, that Prince George arrived fashionably late. Prince William joked about this back in July 2013 when he and Kate introduced the 1-day-old future king to the world, saying, "I'll remind him of his tardiness when he's a bit older."

Georgie wasn't too off the mark with his arrival, though. A few months prior to giving birth to her first child, Kate told reporters that while her due date was "around mid-July" (she gave birth on July 22), she recognized that "apparently babies have their own agenda."

Perhaps royal baby No. 2 just wants to build up even more anticipation for his or her (hopefully) imminent arrival!

Love all things royal? Watch The Royals on Sundays at 10/9c on E! Make sure to follow The Royals on Twitter and Facebook for the latest updates!