Teigen posted a photo on Instagram of the couple with the caption: "John and I are so happy to announce that we are pregnant :) As many of you know, we've been trying to have a baby for a while now.

"It hasn't been easy, but we kept trying because we can't wait to bring our first child into the world and grow our family. We're so excited that it's finally happening. Thank you for all your love and well wishes. I look forward to all the belly touching! Xx"