'The Big Bang Theory' stars place handprints in Hollywood

"We just taped our last episode last night," Parsons said at the ceremony. "The chance to get to memorialized like this is very fit-in and very moving. It is the most unbelievably perfect end of this experience."

According to Forbes, Parsons, known for playing physicist Sheldon Cooper, who has a genius-level IQ but displays a fundamental lack of social skills in the television series, is the world's highest-paid television actor in 2018.

"The Big Bang Theory" shot its 279th and final episode on Tuesday on the Warner Bros. TV lot. It will air on May 16 on CBS.

The sitcom reportedly averaged 18.6 million viewers per episode in its 11th season (2017-2018), which is more than any other show on U.S. television. Not only well received in the United States, the show also broadcasts in over 70 countries, including Britain, Canada, China and many more.

"Thank you to China for supporting our show, loving us and we love you back," Nayyar told Xinhua at the ceremony. Nayyar is known for his role as Rajesh Ramayan Koothrappali in the sitcom.

"This writing goes across the world. It reaches so many people because it is simply hilarious and these are so lovable and it is completely worldwide," Cuoco, who has played Penny in the sitcom, added.