No, Katie is not still married to Derek. Their marriage, which began on Married at First Sight, concluded in divorce.
The End of Their Marriage
Katie and Derek's journey on Married at First Sight Season 10 ultimately led to separation and divorce. Several factors contributed to the dissolution of their union, including Katie's evolving thoughts about marriage and persistent communication issues between the couple.
Katie's Life After Divorce
Following her split from Derek, Katie has moved forward with her life. She has since found a new partner, whom she met through a dating app, and they are now married. Katie has also welcomed a child with her new spouse. She frequently shares updates about her family life and content focused on her new family on platforms like Instagram.