Ashton Kutcher thanks his Two and a Half Men co-star Jon Cryer as final episode airs

Ashton Kutcher paid a moving tribute to his Two and a Half Men co-star Jon Cryer as the hit comedy show draws to an end after 12 seasons. On Thursday the actor posted a photo of himself with Jon on Facebook, adding a touching tribute to the actor who he has worked with since 2011.

"Thank you Mr. Cryer for making this job never feel like work," wrote Ashton. "I will miss working with you every day. You are a true partner in every sense of the word.

"In four years I never heard you complain and never heard you speak ill of another person even if they took advantage of your kindness and generosity," he added. "You are a gentleman. You are a talent. You are someone I look up to. See you tomorrow night. ‪#‎twoandahalfmen‬."

Ashton, 37, wrote a separate tribute to Jon on Twitter, which the 49-year-old star retweeted.

"A toast to my talented co-star," posted Ashton. "Thank you for making this job exceed every expectation I had for it."

After a 12 year run, Two and a Half Men will air its final episode on Thursday 19 February.

Ashton joined the cast of the hit CBS show when it was in its eighth year, following Charlie Sheen's dramatic exit in 2011.

Many Two and a Half Men are hoping that despite Charlie's character Charlie Harper dying inbetween series eight and nine, the actor will make a surprise return in the final episode – which is called Of Course He's Dead – Part One and Part Two.

Ashton took over from Charlie in series nine, making his first appearance as Walden Schmidt in the episode Nice to Meet You, Walden Schmidt.