Coming to an end ... Amy Brennemanand Kate Walsh in medical drama Private Practice.

Coming to an end ... Amy Brenneman and Kate Walsh in medical drama Private Practice.

Grey's Anatomy spin-off Private Practice will end mid season, according to the show's creator Shonda Rhimes.

Rhimes sent out a tweet confirming the show will finish at episode 13 of series six, saying it was "heartbreaking" to see it end.

"I'm sad to say that Private Practice's run will end after episode 613 this season. 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."

The show is set in a family medical clinic and centres around neonatal surgeon Dr Addison Montgomery, played by Kate Walsh.

The writing has been on the wall for the show ever since Walsh announced earlier in the year that this would be her last season. At the time the ABC network said it was committed to continuing without her if the ratings held up but Rhimes had told TV Guide that Private Practice had "a lot of budgetary issues".

"It's heartbreaking to end. Truly," wrote Rhimes today. "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. And there's a family here, of crew and cast, people who have bonded over these past five and a half seasons."

Private Practice is a spin-off from the popular medical drama Greys Anatomy, currently in its ninth season, and celebrated its one hundredth episode earlier this year. It was a success story for Rhimes who is also the creator behind Scandal, a political drama starring Kerry Washington currently showing on Seven.

"It's rare for a show to go for more than 100 episodes and we are incredibly proud to have been such a show. And we're grateful to all of you for spending time with us for an hour every week for the last 6 years. It's meant the world. Thank you."

According to The Hollywood Reporter Walsh is currently creating a comedy at NBC. Season six of Private Practice is yet to air on Seven.