Liza Miller - Younger
The Supportive Ex. Liza wasn't technically a bridesmaid, but she did fly out all the way to Ireland on a whim after receiving a call from her ex-boyfriend who planned to marry a woman he barely knew. Oh, and she promised to be a witness and lie to immigration about it all. It's no surprise that the marriage fell apart in just a few months.
Princess Eleanor - The Royals
The Honest Soon-To-Be-Sister-In-Law. Honesty is so important, especially on your wedding day. You need someone who is going to be real with you when it comes to life-altering decisions. And what's more honest than your soon to be sister-in-law telling you that her brother, the King, might be using you to further his hold on the country?
Rebekah Mikealson - The Originals
The Wise One. Rebekah couldn't have her fairytale love story for many reasons, but she was there to offer advice and support when her sister Freya got cold feet. She helped calm her down, encouraged her to be honest about her feelings with Keelin, and got the wedding back on track.
Izzie, Meredith, Derek - Grey's Anatomy
The One That Becomes the Bride. Okay, so this is not how a wedding night usually ends, but Izzie put her heart and soul into planning Meredith and Derek's big day. When they realized she had an inoperable tumor, they gave her the wedding instead fearing that she might not make it. Cancer couldn't stop her from being a beautiful bride. It's a reminder that we all need such loving and selfless friends for the happy and sad moments in life.
Kara Danvers - Supergirl/The Flash
The Protector. Kara traveled to Earth-One to be there for Irish and Barry, and despite her own broken heart, managed to be genuinely happy for the both of them. She even lent her singing voice for the ceremony and when Nazi troops crashed the party, kicked butt and helped save the day. Did I mention she has the voice of an angel?
The Ladies of Pretty Little Liars
The Ones That Share a Secret. Through thick, thin and years of torment from "A." Turns out, nothing bonds a group of teenage girls together quite like a disturbed stalker and deadly secrets. And when the time came for a more joyous occasion, namely Aria's wedding to former teacher Ezra Fitz, they all showed up to celebrate and support each other.