Justin, 31, is fortunate to have Hailey, 28, at his side during this crucial phase. “She is a calm, humble and realistic person,” the insider said. “Hailey is not going to let Justin ruin his life or career as he embarks on this new chapter, and she has always been a very positive force in his life.”

Although the Grammy winner can become “emotional” and “overly passionate about almost anything,” Hailey knows how to bring him back to reality.