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With the clock winding down to the final episode of Paramount Network's "Yellowstone," series star Kelly Reilly took to Instagram Sunday to confirm that the Dec. 15 episode is in fact the finale to the mainline series.

"Hi, I'm so deep into another role at the moment about another land worth fighting for in the UK," Reilly wrote. "But across the pond, the finale is happening tonight of the show. Whatever the future holds this is the ending of the show we have been making for the past 7 years."

Reilly went on to thank "Yellowstone" creator Taylor Sheridan as well as the entire cast and crew of the western drama.

"Words cannot convey how I feel about the people I got to work and create with over the seasons," Reilly added. "I have made true lifelong friends. The support from the crew and the trust and dedication of the cast. The words I got to say and the woman I got to inhabit. It changed me. It lit me up. It challenged me in every way possible and I will forever be grateful for it. For Taylor Sheridan who took a chance on me and continued to write her in ways I got to feel on fire as an actor. Thank you Taylor."

Although this means the end for the main series, Reilly will soon star alongside her on-screen husband Cole Hauser in a "Yellowstone" spin-off series following their characters Rip Wheeler and Beth Dutton. Sources confirmed to Variety that the series is nearing production.