The EastEnders star triumphed over former Pussycat Dolls singer Ashley Roberts to become the public's winner after 21 days in the Australian jungle.
Upon hearing the result, Brooks was visibly delighted, with her campmate congratulating her on the win, before being given her crown by Ant & Dec.
The 31-year-old then said when asked about her victory: "[It feels] silly. I never imagined this for a million years.
"Everyone's been amazing. David was our king down there. Eric with the fire. Everyone down there played their role."
Brooks and Roberts had previously taken part in the challenging 'Final Feast' Bushtucker Trial, in which the pair had to eat delicacies including camel penis, witchety grubs and raw fish eyes in order to win a Mexican-themed final meal.
Roberts said of the ordeal: "That was the most disgusting thing I've ever done in my life.
"That eyeball and the popping of the eyeball. It smelled. I am never doing anything like that again in my entire life."
Brooks added: "I feel absolutely traumatised. It was horrendous. There was no other way of describing it."
The actress also reunited with her 7-year-old daughter Kiki before finding out her fate in the jungle.
She becomes the 12th celebrity to win the reality series, succeeding last year's King of the Jungle Dougie Poynter.