The multi-Grammy award winning singer served as the maid of honour at her childhood friend's wedding in their hometown of Pennsylvania.
The pretty blondes were both radiant in bespoke Reem Acra designed gowns.
The bride, who is tied the knot with her childhood sweetheart Benjamin LaManna, wore a white cap sleeve lace A-line wedding dress, paired with a cathedral-length trimmed veil.
Taylor complimented the lady of the moment in peach gown with a sparkling, embellished bodice.
The 26-year-old took to Instagram to share moments from her bestie’s big day.
"I met her when I was 10 days old, and him in kindergarten," Taylor penned a group snap.
"Now they're married and I'm the happiest maid of honor ever. Congratulations @britmaack and Ben!"
Leaving her main squeeze Calvin Harris back in LA, Taylor also shared a sweet flashback of herself and Brit captioning it simply as “Freshman year.”
Taylor was bursting with pride about the milestone in her loved one’s life.
"I've never been a maid of honour before. This is my first time, and it's really, really important to me because this is my best friend, who I've known since I was born. And she's marrying someone I've known since I was 4," she gushed to People back in May.
Clearly taking her maid of honour responsibility seriously, Taylor discussed how they decided on choosing Reem as their wedding designer.
"Reem does the most amazing bridal designs, and Britany and I were looking through Vogue, and she pointed to this one gown, and I was like, 'I wonder if we could go to the showroom…,'" she said, before adding that they went to the New York showroom and it was “the best day ever. It was so amazing."
If you’re going to be a bridesmaid, you may as well do it in style!