You never know at that age.
Prince William, Princess Kate, Prince George, and Princess Charlotte
Credit: Samir Hussein/WireImage/Getty Images

She may be one of the most recognized women in the world, but the Duchess of Cambridge is first and foremost a mother. In the days leading up to her sister Pippa's high-profile wedding to financier James Matthews, Kate Middleton admits she's worried about how her two youngsters will behave. Two-year-old Princess Charlotte and three-year-old Prince George both have starring roles in this weekends' nuptials, as a page boy and bridesmaid, respectively. Big roles for anyone, let alone toddlers.

During the Buckingham Palace garden party this week, the duchess revealed that while she's looking forward to the festivities, she's also anxious.

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"She said that they were all really looking forward to her sister's wedding at the weekend, but she was a bit worried about how her children might behave," garden party attendee Andrew Bates told People after a brief chat with Middleton. " She said she was hopeful that they would be good, but you never know at that age."

The couple is due to wed in a private ceremony at St. Mark's Church in Englefield on Saturday May 22. A reception at the Middleton family home will follow.

Even if they don't behave, at least they'll be cute!