Eighteen months ago, Kylie and Lisa Caro walked down the aisle for the first time.

Wearing white gowns, they met at Centennial Park to pledge their love for one another in a commitment ceremony watched by family and friends.

Kylie and Lisa Caro were married at Centennial Park on Tuesday. Credit:Jessica Hromas

But there was one thing the ceremony was unable to do: declare them legally wed.

On Tuesday, the couple again donned their dresses. This time they were getting married, after the government voted last year to legalise same-sex marriage.