Kaley Cuoco Says She's 'Thrilled' With Where Penny Ends Up in 'The Big Bang Theory' Series Finale (Exclusive)

The actress told ET she's all cried out after an emotional few days wrapping the beloved sitcom after 12 seasons.

Kaley Cuoco has cried her way through the final days of production on The Big Bang Theory, but she held it together at Wednesday's series finale event!

"I might be cried out, if that's possible," Cuoco joked with ET's Nischelle Turner on the red carpet. "It's been an unbelievable couple days."

"There [have been] a lot of tissues," the actress emotionally admitted. "It started with reading that initial script, and then last night shooting it in front of the audience, and this morning with the hands at Mann's Chinese [Theatre]. It's just been a beautiful tribute to our show. I don't know, I just feel so grateful. It's been a gift, a gift of 12 years."

The cast shot their final episode of Big Bang's 12-season run on Tuesday night, and on Wednesday, the stars were honored with a handprint ceremony at the TCL Chinese Theatre in Hollywood. But Cuoco confessed that the emotional journey started with some concerns over how the CBS comedy's creative team would wrap up the beloved characters' stories in a way that paid tribute to both the stars and the show's devoted fanbase.

"This has been a stress for months [for] us actors, and the writers -- how's this gonna end?" she recalled. "This is my legacy of this character, on and on."

But those fears were more than assuaged by the emotional two-part finale, which Cuoco called "amazing." "It is the most beautiful finale I have ever seen, and I love finales," she raved. "It is so touching. You're gonna cry, but in the sweetest way. I don't know how to describe it, other than it's absolutely the sweetest thing in the world."

"I'm thrilled with [Penny's] ending, yet beginning," Cuoco added. "It's beautiful. There's not anything catastrophic, it's just beautiful. And the characters are gonna live on in your minds and in your hearts, and I think that's what is so special about it. It's really touching."

As for the possibility of a future spin-off, reboot or revival series, Cuoco isn't quite ready to sign on, but admitted that there is one person she would consider an offer from.

"The only person I would say yes to is [Big Bang creator and executive producer] Chuck Lorre," she said. "So if Chuck came and said let's do it, I'd say yes. Other than that, I don't see a spin-off for myself. But I don't like to say no to Chuck. So if he wanted it, I'm in!"

At their handprint ceremony at the Chinese Theatre, Cuoco gushed over her time on the show, and her fellow co-stars, saying, "This is the greatest cast in the world. I feel so honored to be up here."

She also opened up about the finale, saying, "It's an incredibly touching final two episodes. I think we can say that. It's unbelievably special."

See more in the video below. The Big Bang Theory's two-part finale airs Thursday, May 16 at 8 p.m. ET/PT on CBS.