Sam appeared to spark a new feud between the pair by choosing to follow Lillie, and his move didn't go unnoticed, with Gary calling him out for it in front of his 170,000 odd followers.
He tweeted: ".. @SamReece following my ex isn't going to do anything... You could try f*** her seems only fair since I have banged yours.... Game on."
Gary then added: "Don't even no why I said ex because she is technically still your GF... I hit it, I hit it, I hit it, I hit it, I hit it, I hit it first...."
So far, Sam or Lillie have not responded to Gaz - who has openly revealed he has previously slept with Sam's girlfriend Stephanie Davis.
On hearing the former Hollyoaks star was going into the CBB house alongside his co-star Scotty T, Gary warned Scott to stay away from her. He said: "Don't go there because then you'll be getting my sloppy seconds kid."
Stephanie has since hit headlines, thanks to her flirty behaviour on CBB which has seen her kiss her housemate Jeremy McConnell under the bedsheets. And the spotlight has been put on her beau Sam, after he appeared to publicly dump her on Twitter.
Sam told fans he was withdrawing his support from the 22-year-old, but later said he hasn't dumped Stephanie and they are still together. He insisted he would never end a relationship over text or social media, but has said he will be speaking to Stephanie when she leaves the house.
Gary, meanwhile, has openly tweeted about Stephanie and Sam's relationship in recent weeks and he appeared to make a dig at First Dates star Sam too.
When Sam had tweeted to ask for song choices to run to, Gary replied back: "1D Everybody wants to steal my girl."
Sam never responded to Gary's jibe.
Gary then targeted Sam again after sharing a screenshot of a rant posted by his former co-star Daniel Thomas.
In it, Daniel says he thinks Sam "is loving the attention" he is getting from Stephanie's CBB romance drama and claimed the model had slept with other girls behind Stephanie's back in the past. Gary then tagged Sam into the tweet sharing the message.
Daniel's claims follow allegations that have surfaced in the press recently. Two girls have accused Sam of being unfaithful, however his rep has dismissed such reports, insisting Sam denies they are true.
He, meanwhile, took to Twitter and cryptically tweeted: "Don't believe everything you read... it's laughable."
Sam later added: "Real shame there are so many narrow minded people."
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