The former couple, who split in December, have agreed to meet in Los Angeles for the first since announcing their divorce.
The pair will discuss the details of their separation, although Perry apparently wants to try and salvage the relationship.
"He has agreed to meet her one last time. He wants to sort things out and finalise the divorce," a friend told the Sunday Mirror. "Removal trucks have been moving his things out of the house they lived in and into a new place that Russell is renting.
"He needed to be in LA for the [Golden] Globes too, so it was an ideal opportunity to meet. He is determined to move on. But Katy says she is still in love with him and she still has hopes they might get back together."
The 'Teenage Dream' star is said to be staying at the Beverly Hills Hotel, where she is being comforted by parents Keith and Mary Hudson, while Brand has moved into a £1.5m bachelor pad.
The source added: "She is doing OK under the circumstances, but this has been a very tough road for her. Keith and Mary have also been reaching out to Russell and sent him a text telling him he is in their thoughts and that they love him."
Pastor Paul Endrei, a close friend of Perry's parents, also rubbished claims that they wanted to set their daughter up with Christian Denver Broncos NFL star Tim Tebow, saying there is "no way" the star would start dating before her divorce is finalised.
Watch Katy Perry's video for 'The One That Got Away' below: