‘How I Met Your Mother’ Season 9 Spoilers: Robin Daggers Makes Appearance On Cobie Smulders Twitter With ‘Karate Kid’ William Zabka Guest Star

"How I Met Your Mother" season 9 premiere is less than a week away, and spoilers and hints continue to leak about the premiere of the final "HIMYM" season.

In a recent Twitter post, Cobie Smulders, who plays Robin Scherbatsky on "How I Met Your Mother," leaked a huge spoiler for season 9: Robin Daggers would return. Cobie shared an Instagram picture of herself on Twitter, dressed as Robin Daggers.

For those of you who've forgotten, Robin Daggers is the alter ego of Robin Sparkles, the pop-star character that Robin played when she was a teenager in Canada.

Although it has yet to be confirmed, "How I Met Your Mother" fans have speculated that Robin Sparkles would be returning for one last appearance in the final "HIMYM" season, IB Times reports.

Smulders even dished to IGN that she thinks Robin's teen alter-ego should come back in "some way," but was uncertain how.

The actress suggested that "a song to the groom at the wedding" could potentially happen.

Cobie Smulders sports a dark wig, black eyeliner, a plaid flannel shirt, and a faux-somber expression in her Instagram picture.

But who Smulders is standing next to may also reveal some spoilers for season 9: the "Karate Kid" star William Zabka.

Zabka, the "villain" from "The Karate Kid," made an appearance is season 8 of "How I Met Your Mother" at Barney's fail of a bachelor party.

Entertainment Weekly reports that Zabka will appear as himself in "at least" eight episodes this season.

The leaked news, according to Enstars, was supposed to be kept top secret by creators Carter Bays and Craig Thomas. Looks like Smulders let the cat out of the bag with this spoiler!

Smulders captioned the Instagram photo with: "Would you buy this bands album?"

"How I Met Your Mother" season 9 premieres on Monday, Sept. 23 with a special hour-long episode.