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'The Big Bang Theory': Kaley Cuoco shares then and now photos of Halloween episodes with Johnny Galecki

Sadly this will be the final Halloween dress up for the cast of TBBT, as it was revealed earlier this year that the sitcom will end after its current season

Kaley Cuoco surprised her 'The Big Bang Theory' fans on Thursday. The actress, who plays the role of Penny, shared a sneak peek to the seasons Halloween episode. 

Cuoco created a collage and shared a throwback picture from the series's season one's Halloween episode along with a glimpse of season twelve's Halloween episode on Instagram. 

In her post, Cuoco shared the then and now pictures of herself and her onscreen husband Johnny Galecki (who plays Leonard Hofstadter), with the throwback image showing Cuoco wearing cat ears and a collar, with Galecki looking like the Hobbit. And the final season's image revealing that she will be a barmaid and Galecki dressed up as Inspector Gadget. 

Her caption read, "From a Season 1 kitty kissing a hobbit, to a Season 12 bar maid married to Inspector Gadget. Don’t miss and all NEW @bigbangtheory_cbs Halloween episode tonight!" 

Sadly this will be the final Halloween dress up for the cast of TBBT, as it was revealed earlier this year that the fan favorite CBS sitcom will end after its current season 12 that airs every Thursday. 

The ending of TBBT seemed to have taken a toll mostly on Cuoco, as it was earlier revealed that the actress admitted to crying for an entire week after the news of the series ending was announced. In an interview with USA Today, Cuoco said, "When we heard the news, I went through a terrible week. I was so upset. I cried every single day." TBBT was initially planned to run for another two seasons, but the announcement in August brought the impending finale much closer than she could expect.

'The Big Bang Theory' happens to be the longest-running multi-camera series till date and Kaley has played the role of Penny since the show’s beginning in 2007. She stars alongside Jim Parsons, Johnny Galecki, Mayim Bialik, Melissa Raunch, Kunal Nayyar and Simon Helberg.