TMZ reports the model moved in with Brown before his 24th birthday in May and shortly have his break up with Rihanna. If you don't recall, Brown left Tran in the first place to get with Rihanna (again).
Tran is keeping her apartment for the time being, but is moving in tons of clothes and other personal items into Brown's Hollywood home.
The couple hasn't been trying to keep their time together secret - they were even involved in a car accident together.
Back in October when they first broke up, Tran claimed publicly she was going to win Chris back. We'll probably never know whether that ultimately led to him to leave Rihanna, but the two are together now.