Anniversary vs. Niece 1st Bday

My niece turns 1 the day before our first wedding anniversary. They're planning a big birthday party but hubby and I were planning to take our kick ass European honeymoon during that time, even more so since I'm pregnant and it'll be our last big trip before baby arrives. They were planning to do a cake for us...I honestly don't want to share the day or steal baby girl's thunder. Is it wrong if we skip it?

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