The trio are set to enter the house on Friday night following another huge twist for the show.
Show bosses revealed last week that past housemates will return to the house in a secret bunker, where they will be joined by either Simon Gross, Marc O'Neill and Sam Kay, who face eviction on the night.
Little do the housemates know that the eviction is fake, and so the nominated housemate will actually be living with the past famous housemates in the bunker.
The 'evicted' housemate and the famous trio will live in the secret lair for just 48 hours and spy on the unsuspecting housemates in the main house.
According to the Daily Star, Helen, Gina and Nikki will be back on the show for a week, as after the 48 hours is up, host Emma Willis will send everyone in the secret bunker back into the main house in a 90-minute live show dubbed the 'Time Warp live launch'.
A source told the newspaper: "This twist is likely to cause a lot of tension. The famous Fight Night happened because housemates spied on others."
Helen, 28, won last year's series of Big Brother, while Gina took part in series 14 in 2013. Nikki first appeared on the show in 2007.
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!