The four were put up for eviction after receiving the most votes in this afternoon's (August 26) third round of nominations.
The results were confirmed on the official Channel 5 website. Housemates took over three hours to complete the latest nominations.
It is the second time that The Situation and Rhian have been nominated, while Samantha and Danica face eviction for the first time.
Voting will open to the public during this evening's edition of Bit on the Side at 10pm on 5*.
Cheryl Fergison became the second person to leave the house on Friday (August 24).
Photo gallery - Celebrity Big Brother Day 11:
Copyright: Channel 5