The 44-year-old actor and the 30-year-old beauty's divorce was finalised last October, but they recently decided to start sharing a home again, reported People magazine.
"Josh and Jessica are living together now, in New York City with Noah, their son. They moved in because she starts grad school at Columbia University in September and Josh's show has him working insane hours.
"They recently moved in together so that they could both be with Noah as much as possible despite their schedules, with work and Columbia requiring so much time away," a source said.
But they have remained close friends and were spotted enjoying a family holiday in Bali together in May.