The outlet also claimed that the pair had been introduced by the Atomic Blonde's ex-fiancee Sean Penn.
Charlize Theron began a three-year romantic journey with musician Stephan Jenkins up until October 2001.
Theron was special guest at a showing of "Roma" at the historic Chateau Marmont Hotel.
"Brad came over to Chateau afterwards, changed his outfit and joined Charlize in a corner of the bar", a source stated. The insider described their interaction as "ridiculously touchy-feely", with Brad cradling her back, as well as even winking at her.
Since 2016, Brad has been is the middle of a nasty split with Angelina Jolie, which reportedly resulted in him getting sober. Once Hollywood's golden couple, the pair made headlines for most of 2018 over their ensuing custody battle over their six children.
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This was a bit of a surprise at the time because it appeared as though Jolie and Pitt would bitterly fight in a court of law for a while.
The sparks between Brad Pitt and Charlize Theron reportedly happened around Christmas and they are still in the early stages of their relationship.
Theron ended her engagement with Penn back in 2015 after the two has started dating in December 2013. "At one point he winked at her. Brad seemed in a really good place - they both looked really happy", the source added.
Meanwhile, Charlize was last linked to Swedish actor Alexander Skarsgard of Big Little Lies fame.
Now that Theron is dating Angelina's estranged husband Brad Pitt, the relationship between the two actresses will probably never heal.