‘The Big Bang Theory’s Kaley Cuoco is Heartbroken, Wanted 20 More Years

The Big Bang Theory star Kaley Cuoco says she would have done two more decades of the soon-ending sitcom, which launches its final season tonight on CBS.

"It's broken my heart, I'm so sad that it's ending," Cuoco told Extra during a Much Love Animal Rescue event in Los Angeles. "For the record, I would have done 20 more years."

When asked who cried the most in saying goodbye, Cuoco swiftly raised her hand. "I have to admit, I was bad, but everyone was crying," she said.

The Penny actress wouldn't dish on any major guest stars stopping in this last run of episodes — past seasons saw appearances from Marvel Comics creator Stan Lee, Star Wars' Carrie Fisher and James Earl Jones, Buzz Aldrin, Batman star Adam West, and a voice cameo from Star Trek's Leonard Nimoy — saying only, "I think we were all hoping for a giant 'Bazinga,' to be honest with you."

Cuoco said she has "heard nothing" about potential spinoffs, but noted she would work with co-creator and producer Chuck Lorre — the mastermind behind sitcom hits Two and a Half Men and Mom — in a heartbeat.

"If he called me and said 'Let's do something' tomorrow, I would do anything with him," she said.

Cuoco wrote on Instagram last month her time with the show has "been a dream come true" and "life changing."

"No matter when it was going to end, my heart would have always been broken in two," she added in a comment accompanying a photo with her longtime co-stars, including Jim Parsons and Johnny Galecki. "Drowning in tears, we promise to bring you the best season yet... we are goin out with a bang."

The 12th season has served as a top performer for CBS, often claiming the No. 1 comedy on television spot and earning rare multi-season renewals.

"The Conjugal Configuration" – Sheldon and Amy's honeymoon runs aground in New York, while Penny and Leonard discover they are uncomfortably similar to Amy's parents, Mr. and Mrs. Fowler (Teller and Kathy Bates). Also, Koothrappali insults physicist Neil DeGrasse Tyson and starts a Twitter war, on the 12th season premiere of THE BIG BANG THEORY, on a special night, Monday, Sept. 24 (8:00-8:30 PM, ET/PT) on the CBS Television Network.

The Big Bang Theory returns with its 12th and final season tonight on CBS before returning to its regular time September 24.