Kaley Cuoco is keeping mum about her old relationships.

On Tuesday night, the “Flight Attendant” star appeared on “Watch What Happens Live” and was asked a not-so-thinly veiled fan question about her ex, “Man of Steel” star Henry Cavill.

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“Kaley, is the Man of Steel really made of steel?” host Andy Cohen asked her.

“Oh my God!” Cuoco reacted, breaking into laughter. “I don’t know. I never say, ‘I don’t know.’ I always have an answer, but I don’t know.”

Cuoco and Cavill dated in 2013, though the relationship only lasted about 10 days.

Also on the show, Cuoco talked about whether fans will get a second season of “The Flight Attendant”.

“I hope so,” she said. “It was meant to be a limited series, for sure, but we’re hoping. We’d actually really like to do a season 2.”

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Later, Cohen took Cuoco on a tour of some of her past fashion choices, asking her to rate them in a game of “Baggage Claim It Or Not?”

“I do not claim it, that is terrible,” she said of one outfit she wore on a red carpet in 2003.

To another all-black outfit, Cuoco remarked, “I wore that to a Christmas party? They should not have let me in.”