The stars, alongside featured rapper T.I., failed to convince a Los Angeles judge to dismiss a copyright infringement lawsuit filed against them and on Thursday (30Oct14), U.S. District Judge John A. Kronstadt officially rejected the request.
The judge ruled a jury will need to decide if Gaye's heirs are entitled to damages over claims Blurred Lines samples the late musician's Got to Give it Up track.
The Gaye family also allege Thicke used parts of the icon's After the Dance composition for his Love After War tune.
That issue will also be determined by a jury trial.
A start date has yet to be set.
The case has rumbled on for over a year after Thicke and his fellow defendants filed suit to stop three of Gaye's children from pursuing damages after learning they felt the two songs were too similar. Weeks later, two of Gaye's kids filed suit and a sibling has since joined the legal spat.