In scenes which shocked viewers last night (3 August), Aubrey was seen spitting in both a sandwich and then beverage she had made for Bear before he unwittingly consumed them.
Later, US singer Aubrey was hauled to the Diary Room and given a warning about her behaviour.
Fans were quick to take to social media to share their disgust and, as of 5pm today, Mail Online reported that TV watchdog Ofcom had received 74 complaints about the shocking incident.
Former Big Brother star Aisleyne Horgan-Wallace shared her horror during the show, tweeting: "Spat in his tea, u know that's proper nasty..."
Meanwhile, The Hills' and Made In Chelsea's Stephanie Pratt, told her followers: "Literally can't get over what Aubrey did." She added a 'thumbs down' emoji.
This is the second series of complaints made to Ofcom since the new series of CBB launched last week. On Monday, Marnie Simpson exposed her breasts at Saira Khan in scenes which also horrified viewers.
Meanwhile, in tonight's episode Bear receives his own formal warning following heated row with Heavy D. During the fight, he threw a mug against the wall. Security had to be called and Bear was told to sleep in the spare room.
CBB continues nightly at 9pm on Channel 5.