Apparently Jerry O'Connell's sense of humor doesn't stop when he enters the bedroom with his wife Rebecca Romijn.

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The 42-year-old model-turned-actress posted a photo of her husband from behind wearing nothing but his undies for National Underwear Day, and naturally, his tighty-whities say "Who farted?" across his butt. With a similar sense of humor, Rebecca captioned the pic, "keeping it classy as always on #nationalunderwearday."

Meanwhile, the mother-of-two shared a photo of herself for the undie-clad holiday and it's definitely a bit more sexy than her husband's.

It's obvious who has the sex appeal in that family.