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Kaley Cuoco Teases a Hairy ‘Big Bang Theory’ Development (Photo)

Prepare for the return of the Penny-do, “TBBT” fans

Brace yourself for the return of a classic, “Big Bang Theory” fans.

“Big Bang Theory” star Kaley Cuoco took to Instragram on Thursday to alert her followers that Thursday night’s episode would feature an old familiar favorite, perched right on the top of her head.

“Tonight’s all new episode @bigbangtheory_cbs contains lots of laughs and adorable hair,” Cuoco wrote in a caption accompanying a photo of herself with her strands done up above her head.

“@faye.woods bringing back the Penny-do!” the actress added, referencing “Big Bang Theory” hair stylist Faye Woods.

Cuoco, who plays Penny on the long-running CBS sitcom, has been in the habit of offering fans behind-the-scenes looks at the series this season. Earlier this month, she posted a photo of herself smiling and looking away as someone from the comedy’s crew addressed her and the other cast members. In contrast, co-star Mayim Bialik (Amy) appeared rapt with attention.

“Another perfect BTS example of my full attention and work ethic during the live taping of tonight’s episode @bigbangtheory_cbs,” Cuoco cheekily captioned the shot. “We are back on THURSDAYS starting TONIGHT! Lots of laughs coming your way.”

Last month, Cuoco also posted a pic of herself flipping the bird in the direction of co-star Jim Parsons (Sheldon).

“A little inside look at the effort it takes shooting an episode of @thebigbangtheory__ #bts,” she captioned that one.