Jim Parsons had a sheepish moment after spoiling Kaley Cuoco's surprise birthday party.
Parsons shared a photo of a pink cake reading "Happy Birthday Kaley" on "The Big Bang Theory" set. He tagged Cuoco in the caption, alerting the actress of his post.
"almost time, @kaleycuoco ... shhhhh......" the star wrote.
Parsons followed up with a picture of Cuoco's reaction to him spoiling the surprise.
Parsons and Cuoco play Sheldon and Penny on "The Big Bang Theory," which is in its 12th and final season on CBS.
Cuoco discussed the decision to end the show in an interview with "The Late Late Show" in September.
"It wouldn't have mattered when it ended, we all would have been completely devastated," she added.
"It's time now, I guess, to move onto other things, which is so heartbreaking."