'Shameless' season 6 trailer debuts (Video)

The Gallaghers are back and crazier than ever. The Shameless Season 6 official trailer dropped on Friday, getting fans excited for the series to return to Showtime in January.

Star Emmy Rossum shared the trailer on Twitter. “Shameless Season 6. Full trailer. See what is in store. #Shameless,” she wrote with a link to the video.

Rossum also shared a picture with co-stars Emma Kinney (Debbie on the show) and Jeremy Allen White (Lip) on Facebook. The three play siblings on the Showtime hit. “Family #TGIF,” she captioned the shot of the group doing each others hair.

Joan Cusack, who has been recurring since season 1, won a Creative Arts Emmy for her work on the show earlier this year. William H. Macy, who plays the father of Rossum, Kinney and White, has also been nominated for Emmys throughout the series' run.

Shameless returns to Showtime on Jan. 17.