A wedding is not the best place to announce an engagement. In fact, it might be the worst—since the whole point of a wedding is to shower the bride and groom with attention, not take attention for yourself. So unless the bride and groom explicitly condoned and encouraged it, don't do this. A bridesmaid-turned-bride learned this lesson the hard way.
This is a real roller coaster, so hold on to your bouquets!
The juicy bride-on-bride crime story was shared on Reddit by a cousin of the groom at the first wedding. They write:
Last summer I was at a cousin's wedding. His bride and her family had been close with ours since before I was born, and the couple had known each other since they were toddlers, so it was a particularly exciting event for both sides of the family.
However, after the ceremony was over and the party had only just started, one of the bridesmaids decided to announce her own engagement. The attention was immediately taken away from the newlyweds and brought to the bridesmaid (who I'll call Sarah) and her equally-smug fiancé. My cousin's wife (I'll call her Emma) didn't make a scene or utter a single negative word about Sarah. She looked like she was on the verge of tears, but she kept grinning and acted very happy for the other couple. This was unusual, as Emma is typically quite confrontational and speaks her mind no matter the consequences.