Justin Bieber -- Rents Famous ATL Spaceship Mansion

Justin Bieber has found a new home in Atlanta -- for the next three months -- and the 5,500 sq. ft. mansion looks like something out of "Star Trek."

Sources tell us, Bieber moved into the 4-bedroom spaceship-looking home of record producer Dallas Austin last week -- the guy behind songs like "They Don't Care About Us" by Michael Jackson, "Don't Let Me Get Me" by Pink, "It's So Hard to Say Goodbye to Yesterday" by Boyz II Men.

Dallas is also Chili's baby daddy ... Chili from TLC.

We're told Bieber plans to live in the USS Enterprise while he works on his new hip hop album -- and shops for his own place.

As we reported, Bieber's been mansion hunting in Atlanta's exclusive Buckhead neighborhood -- where Usher currently lives -- but so far, he hasn't found his dream home. His plan was to have another home in L.A. and to split his time between the 2 cities.