The "Grey's Anatomy" spinoff, starring Kate Walsh, will have an abbreviated final season because the network opted not to pick up the planned final nine episodes, Rhimes said in a series of tweets.
"There was a lot of discussion and debate but, in the end, the guys at the network and the studio and I all decided that 'Private Practice' was reaching its finish line," she said. "It's heartbreaking to end. Truly. I feel so lucky to write for these characters and tell these stories and I truly feel this show has taught me so much as a writer."
Viewership for the California-set medical drama dropped off last season when it was moved from its post-"Grey's Anatomy" slot on Thursdays to Tuesdays after "Dancing With the Stars," The Hollywood Reporter reported Friday.
"Private Practice" had a first-season average of 11.5 million viewers, which has slipped to 6.1 million this season.