Don’t steal my thunder
Number one rule of any wedding: If you aren’t the one getting married, then nothing is about you. Don’t wear white or anything that’ll take the attention off the bride, don’t propose, don’t announce a pregnancy to the whole wedding, you get the idea. This is the bride’s special day – get your own! This woman either didn’t know the number one rule or straight up didn’t care.
Wow, there are no words for this act. Have you any decency? Is your niece really all that special that you can’t wait for a different day to celebrate her birthday? Or at least wait until you leave the wedding venue? We’re going to guess that the answer is no to both of those. It seems like she was trying to steal the bride’s thunder as well as her party.