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When Pippa Middleton ties the knot on Saturday, all eyes (especially Princess Kate’s!) will be on the littlest bridal party members.

During the Buckingham Palace garden party on Tuesday, the royal mom revealed that while she’s looking forward to the festivities, she’s a little nervous about how Prince George, 3, and Princess Charlotte, 2, will behave in their starring roles as a page boy and bridesmaid.

Kate Middleton, Prince William, Charlotte, George
Credit: Max Mumby/Indigo/Getty

“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 reporters after his chat with the royal.

“She said she was hopeful that they would be good, but you never know at that age.”

Kensington Palace confirmed George and Charlotte’s roles in their aunts wedding in April.

Pippa Middleton, James Matthews
Credit: Samir Hussein/WireImage

Middleton and financier James Matthews are set to wed in a private church ceremony at St. Mark’s Church in Englefield on Saturday morning, followed by a lavish reception within a glass palace currently being built at the Middleton family home.

This Story Originally Appeared On People