Prince William, Duke of Cambridge

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Prince William may be on paternity leave, but a royal's work really never ends.

With wife Kate Middleton due to give birth to their second child any day now (maybe it was supposed to be yesterday, maybe it's tomorrow, or maybe next week!), the Duke of Cambridge does still have somewhere he's supposed to be this Saturday—which, according to some earlier reports, is actually Kate's due date, April 25.

While surely they can get along without him if daddy duty calls, William is expected to join grandparents Queen Elizabeth II and Prince Philip at a wreath-laying ceremony at the Centenary in Whitehall to commemorate Anzac Day and the 100th anniversary of the World War I Gallipoli Campaign, a battle that began in April 1915 and lasted for eight months. (Anzac Day pays tribute to Australians and New Zealanders who served and/or died in any armed conflict or peacekeeping mission.)

A Kensington Palace spokesperson confirmed to NBC News today that William recognizes the event's importance and still plands to attend. There's no official word, meanwhile, on what happens if Kate is in the hospital during the ceremony.

We're just guessing, but...

It seems as though the queen will have this one covered!

Elizabeth and Philip, a World War II veteran, are also due to attend a Service of Remembrance at St. Paul's Cathedral in London. Their daughter, Princess Anne, is scheduled to attend the Dawn Service at Wellington Arch marking the aforementioned occasions as well.

WATCH: Don't miss a new episode of The Royals, Sunday at 10 p.m. on E!

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