Kim Kardashian pulled out her 2012 Halloween costume for a very special occasion!
The 35-year-old KUWTK star donned the sexy mermaid ensemble, sans the blonde wig, for daughter North West's nautical-themed birthday bash — and it was definitely the mother-daughter duo's best matching moment ever!
"North and P's birthday was so cute," she wrote on her website. "We had the best stuff for the kids. The ambiance was perfect."
Proud grandmother Kris Jenner also shared a pic from the joint celebration with Penelope Disick, 3, showing the pair from behind!
"In love with these pics from North and Penelope's mermaid-themed birthday party!!!," the 60-year-old captioned the candid snap.
For more of Kim and Nori's best coordinated moments, check out the gallery below!