The Sun is claiming that the two were introduced by mutual friend Sean Penn, who is also Theron's ex-fiancé.
“They have been casually seeing each other for nearly a month now," a source close to the alleged couple told the outlet. "They’ve been friends for some time - ironically through Sean - but things have developed.”
The new couple were apparently spotted meeting up at Chateau Marmont in Los Angeles last weekend after they each attended separate film screenings.
If the reports are to be believed, this is Pitt's first public relationship since announcing his divorce from Angelina Jolie in 2016. Pitt and Jolie share six children together, and Theron has reportedly yet to meet any of them, The Sun claims.
During an interview with Vanity Fair in 2017, Jolie insisted that her and Pitt's complicated schedules had nothing to do with their decision to separate.
"We care for each other and care about our family and we are both working towards the same goal…I do not want my children to be worried about me," she told the outlet. "I think it's very important to cry in the shower and not in front of them. They need to know that everything's going to be all right even when you're not sure it is."