Kate Middleton's second child is definitely an active little one.

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The 33-year-old princess attended the opening of a recreation center in London on Monday and according to one attendee the little prince or princess wouldn't stop moving.

"[She said] 'It's moving all the time. I can feel it kicking now'," student Martina McDonaugh told People on Monday.

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"I told her I hoped it was a girl but she said she doesn't know yet," added 17-year-old Martina. "But she said she doesn't know yet. She said it was moving around a lot."

The site of the new recreation center happens to be where Kate's husband, Prince William, learned to swim when he was a boy. There had been a pool there prior to the renovation.

"[Kate] was talking about Prince William learning to swim here and she said she hoped Prince George can come here to learn too," noted Cabinet member Tim Ahern. "If George goes to school at Wetherby or one of the other local schools, he will almost certainly come here. Wetherby will use it."

In honor of the opening, Princess Kate received a lifetime membership to the center, as well as some pool-themed gifts for her one-year-old son, George.

Prince William was absent from the event, as he is still pursuing his studies. Kate will continue will her royal duties solo this month. She is expected to give birth to her second child in April.