On February 14, 2013, Illinois Senate Bill SB10, the "Religious Freedom and Marriage Fairness Act," legalizing same-sex marriage in Illinois, passed the Illinois Senate, was introduced into the Illinois House, and had its first reading in the Illinois House. On March 12, 2013 Berrios was added as an Alternate Co-Sponsor of SB10 in the Illinois House of Representatives. She was one of 24 Representatives to sign on as Chief Sponsor, Alternate Chief Co-sponsor, or Alternate Co-Sponsor, and one of 19 Alternate Co-Sponsors, in the Illinois House. The Illinois House passed SB10 and Illinois Governor Pat Quinn signed the bill into law in November, 2013.