The argument began when Perez was deliberately antagonising the singer, by staring at him and blowing kisses.
Alexander then told Perez: “I know what you want but you’re not going to get it…You’re going to sit there with that silly ass fa***t look on your face.”
Open Image Modal
Alexander O'Neal
A group of their fellow housemates then stepped in, to stop Alexander from making any further comments.
Alexander later went to the diary room, where he formal warning was issued. He then apologised for his choice of words.
"Before when I was angry, I had no remorse. And now I feel a little differently about that - I shouldn't have said that. Period,” he stated. "I don't feel comfortable in any corner of this house. Now I'm being taunted.
"I don't think I've met another human being as pathetic as this person. He's just really dog s**t on the bottom of anybody's shoe. Pathetic."
Saturday night’s highlights show saw a number of clashes, most of which involved celebrity blogger Perez.
Open Image Modal
Perez has now fallen out with all of the housemates - he even managed to rile Cheggers
At the end of the night, Perez told Big Brother that he would like to leave the house - hours after admitting he didn’t want to walk out because then he wouldn’t be paid.
After being told to sleep on it, Perez made his way to the snug and slept away from the other housemates.
Watch ‘CBB’ at 9pm tonight to see the action continue.
Perez Hilton's Celebrity Feuds
Perez Hilton vs. Azealia Banks(01 of09)
Open Image Modal
Azealia caused a worldwide controversy when she branded Perez a "messy faggot" on Twitter, after Perez took Angel Haze's side while the two were embroiled in a public argument.Unrelentless, she insisted: "A faggot is not a homosexual male. A faggot is any male who acts like a female. There's a BIG difference." (credit:Joe Giddens/PA Archive)
Perez Hilton vs. Jennifer Aniston(02 of09)
Open Image Modal
Jennifer Aniston revealed in 2011 that, tired of being branded names like 'Maniston' on his site, she confronted Perez when she ran into him by chance in an LA car-park, asking him: "Why are you so mean?"She said: "We stood there like two deer in headlights. And I just said, "Come here. Just talk to me for a second." It was one of those great moments." (credit:HT/ABACA)
Perez Hilton vs. Lindsay Lohan(03 of09)
Open Image Modal
Lindsay's tumultuous personal life basically carried Perez's website during the height of her celebrity, and she later told him on Twitter: "Karma's a bitch... I can't imagine what yours will be". (credit:Anthony Devlin/PA Wire)
Perez Hilton vs. Lily Allen(04 of09)
Open Image Modal
After Perez alleged on his site that Lily had smoked during her pregnancy, she branded him a "parasite", a "cheap ass whore" and a "jealous and bitter lonely old queen".She later told Billboard that Perez was the "irritating wasp in the beautiful rose garden that is my life". (credit:Neil Lupin via Getty Images)
Perez Hilton vs. Chelsea Handler (05 of09)
Open Image Modal
Chelsea received a mixed reception when she hosted the MTV VMAs in 2010, but didn't seem bothered by the more negative reactions until Perez chimed in, claiming she'd "bombed".She retaliated by telling him that his "whole life is a bomb", before revealing her VMAs stint was the most-watched in eight years. Ouch. (credit:Ray Tamarra via Getty Images)
Perez Hilton vs. Miley Cyrus(06 of09)
Open Image Modal
Miley Cyrus suggested she wanted to "whoop [Perez's] ass" after he reported on his site that she'd been unfaithful to Liam Hemsworth.He also landed himself in serious hot water after sharing what appeared to be an upskirt photo of Miley, taken while she was still underage. (credit:GIMINI/ABACA USA)
Perez Hilton vs. Kesha(07 of09)
Open Image Modal
Aftere Perez published intimate photos of Kesha that had leaked, she claimed he had "ruined" her most important relationship, adding: "He stands for everything I hate. Everything I’m against." (credit:Tammie Arroyo/AFF)
Perez Hilton vs. Lady Gaga(08 of09)
Open Image Modal
They started off as BFFs - Perez even used to refer to Gaga as his "wifey" before she became a global superstar - but things turned sour for these two former best friends, culminating in her accusing him of "stalking her" when he was seen house-hunting in her New York building. (credit:Jerritt Clark via Getty Images)
Perez Hilton vs. will.i.am(09 of09)
Open Image Modal
The biggie - Perez claims that he was assaulted by will.i.am's manager after an awards ceremony in Toronto in 2009, when he approached the blogger over derogatory remarks he'd made about Fergie on his site.It later emerged that Perez had branded will.i.am a "faggot" during their bust-up, which led to the assault. (credit:Ian West/PA Wire)