The "Problem" singer signed to Braun's roster in 2013, joining Justin Bieber among his famous clientele, and she went on to experience huge success with the music guru as her mentor.
The two have yet to officially comment on the news, but an insider insists rumours suggesting Bieber had something to do with the 22-year-old singer's decision are unfounded, reported Entertainment Tonight.
"Ariana always has and continues to support Justin. She did not think the relationship was working for her professionally anymore. It was time to move on. She thinks this is the best professional decision for her moving forward," a source said.
The singer previously admitted she treated Braun as a father figure because she "barely" sees her own dad, Edward Butera, who split from her mother Joan Grande when she was a child.