A breakup is coming.

Sophie Turner accidentally played a part in a celebrity couple breaking off their engagement after a San Diego Comic-Con afterparty run-in years ago.

The actress, 29, explained to Seth Meyers on Thursday that her “quite crazy” evening “went really south really quick” when her childhood friend asked for a favor.

“She saw this actor she, like, loved,” the “Game of Thrones” alum explained on “Late Night With Seth Meyers.”

When Turner’s pal begged her to “say hi,” she simply waved at the man from afar.

“That was it,” the Emmy nominee insisted. “Later on, I see this girl looking at me and she’s a famous actress. And I go, ‘I have to go and tell her how much she means to me.'”

Turner “dance[d] on over” to the woman — only for the unidentified A-lister to ask, “Can yo

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