Model Chrissy Teigen and John Legend have joined the mile high club.

The couple got married in Italy last year, and they got busy under the sheets while flying first class to Thailand to visit the model's parents.

Chrissy shared the secret in Cosmopolitan magazine, saying: "We were under a blanket. We weren't even in one of those pod things. I feel like we should get a trophy for that!"

Chrissy claims she and John are comfortable being openly affectionate when they're in public, and says John likes when she wears a dress so he can slide his hands along her thighs.

She said: "We're by no means freaky-deaky, but let's just say, we're open to things."