Sources have told Globe that the Hollywood superstars, who are both currently locked in bitter divorce battles with former spouses Justin Theroux and Angelina Jolie, have found comfort in each other's arms and reignited their former flame.
'Brad and Jen's chemistry is more intense than ever and they're both crazy about each other right now,' an insider told the US publication.
'They realise their bust-up was the biggest mistake of their lives.'
'They've been hooking up for no-strings attached trysts in LA,' a friend spills to Globe.
As previously reported, the former couple recommitted to each other on the 18th anniversary of their wedding, surrounded by friends George and Amal Clooney and Courtney Cox.
The couple originally wed in a fairytale wedding in Malibu in 2000. But, the union came to a shocking end in 2005 when Pitt moved on with Mr and Mrs Smith co-star Angelina Jolie.
But, his relationship with Angie also resulted in an ugly spit two years ago. The two are currently embroiled in a vicious custody battle over their six children.
Brad's parents Bill and Jane are reportedly thrilled he's seeing Jen.
His mother always had a soft spot for Jen and urged the superstars to give the relationship another shot.
'They're enjoying their hookups like a pair of lovestruck teens,' a friend let slip to Globe.
Brad and Jen are yet to respond to Globe's report.