The blonde, famed for her “who is she?” outburst, filmed herself trying out for the part of Poppy Rogers, a role that show bosses are casting through a UK-wide contest.
In her piece, Nikki likens herself to the character, saying she’s free-spirited, loves going to festivals and is a real risk-taker.
Hundreds of hopefuls have entered the contest, which will allow one aspiring actress to appear on the Australian soap for four weeks.
Nikki was a contestant on the seventh series of Big Brother, and briefly reappeared in the 10th series to take part in a task.
Big Brother returns for its 11th – and final series – this summer.