In a twist, this week's nominations were made by the housemates' closest family and friends.
Aaron and Jem will now go head-to-head in the public vote. Whoever receives the fewest votes to save will be evicted on Friday's live results show.
The housemates were gathered together on Monday to listen to their nearest and dearest voting on their behalf.
Aaron's brother and Harry Blake's girlfriend both voted for Jem and Jay Mckray, while Alex Rose's mum nominated Jem and Faye Palmer.
Jem's boyfriend, Faye's mum and Louise Cliffe's mum all voted for Harry and Aaron, and Jay's mum selected Aaron and Faye.
Finally, Tom O'Connell's mum voted for Aaron and Jem, which sealed the pair's fate.
The nominated duo clashed last week after Jem complained to sister Faye that Aaron didn't stand up to Harry over his criticism of the ex-Gladiators star.
Jem later urged Faye to think very carefully about her relationship with Aaron.
Big Brother continues tonight at 10pm.
Watch highlights from this week's nominations below: