Nikki was blindfolded for the challenge, and with the guidance of Preston, was asked to feel the faces of five female ex-housemates. Preston and the past contestants were not allowed to give her clues. Meanwhile, the other housemates watched the task on the TV screen in the living room.
The first housemate that Nikki attempted was Caroline O'Shea from the very first Big Brother in 2000. Nikki was given a multiple choice of Caroline, Chanelle Hayes or Alison Hammond. Due to confusion between Big Brother's orders and Nikki's guesses, Nikki was allowed a second attempt, and correctly guessed Caroline after hearing her notorious laugh.
Nikki correctly guessed the second box, picking Kathreya from Big Brother 9 over twins Sam and Amanda Marchant. However, Nikki incorrectly guessed the third box, containing Amma from Big Brother 2, instead choosing the option of Kinga from Big Brother 6.
The fourth box contained Grace Adams-Short, from Big Brother 7, the same series as Nikki. Almost instantly, Nikki said: "It's Grace! Stay in the house, I need Big Brother 7 people here, I miss you all!" Her choices were Grace, Carole from Big Brother 8 and Michelle Bass. Nikki joked: "The boobs steered me off Michelle."
The final box contained Anna Nolan, the runner-up of series one. Nikki's choices were Anna, Helen Adams from Big Brother 2 and Big Brother 3 winner Kate Lawler. Nikki incorrectly guessed Kate, saying: "I know it's not Anna."
While Nikki and Preston awaited further instructions, Anna cheekily whispered: "Hi, Nikki." When Nikki asked who was whispering, Anna joked: "I can't tell you, but you got it wrong." Nikki said: "Oh no, it's Anna." Nikki later said of Anna: "I really wanted to meet her."
Afterward, Big Brother called Nikki into the task room for the final part of the challenge. Nikki was given the task of picking the correct housemate from a lineup, all of which were saying that they were Lisa Jeynes from Big Brother 4.
Straight away, Nikki announced that the first lady in the lineup was the correct Lisa, as they each repeated her famous phrase: "Hi, I'm Lisa Jeynes, and I can kill you with these two fingers."
Big Brother later announced that Nikki had won £650 for the next shopping budget, and that housemates will receive some alcohol later this evening. The contestants congratulated Nikki, as several of them declared that they "wouldn't have been able" to correctly guess some of the ex-housemates.