Gay couples in England and Wales can now convert their civil partnerships into marriages.
Despite same-sex marriage becoming legal on March 29, it has taken almost nine months for the government to approve a change to the Marriage (Same Sex Couples) Act allowing conversion.
Gay civil partners across the country have praised the change in law, with one couple saying they are "elated" to be converting to marriage today (December 10).
Ian Scott, 70, and Ron Williams, 82, from Brighton told BBC News
: "We are elated. We never thought it was something which would happen in our lifetime."
Ten couples will complete the administrative process at Brighton Town Hall this morning, with the help of registrar Linda Holm.
"It has been an absolute privilege to lead the registrar team through this year of historic changes in the law and to achieve greater equality for same-sex couples," she said.
To celebrate the special day, Transport for London has brought the rainbow crossing back to London for 12 hours. It is located in Trafalgar Square until 7pm tonight, with couples invited to take a photo in front of the crossing to mark the occasion - read more here
> Europe’s first ‘rainbow crossing’ unveiled in Brighton
> TV show pays for marriage permits to mark gay wedding