Kamau has been married to Phillip Karanja (alias Phil or Melvin), a film director and former Tahidi High actor since November 17, 2017. Their honeymoon was celebrated in Seychelles.[2] In an earlier relationship while at Kampala International University in Uganda, she took in at the age of 19 and gave birth to her first son, Leon Karanja, in 2006[2] who Phillip, her husband, adopted.[15] In September 2019, it was revealed by several news media that she and her husband were expecting their first child together.[16][5][17] The actress was said also to have lavished a baby shower in December of that year to celebrate the pregnancy which was predicted to be a baby girl,[18] and later went on a babymoon in The Maldives with her husband.