Kim Kardashian rewears 2012 mermaid halloween costume to North's birthday party

 Having spent months working out ,Kim Kardashian slipped back into the mermaid costume she famously wore back in 2012 to celebrate Halloween.

 It was appropriate for her daughter and niece Penelope's mermaid themed birthday bash.

You know you have lost your baby weight when you can rock an outfit you wore 5 years ago.