Appearing on The Ellen DeGeneres Show, she said: "Looking at your new image in the mirror ... I looked like a Shar Pei [dog] when I first delivered.
"I was like, 'Oh my God. Am I ever going to be sexy again? Is my man ever going to feel attracted to me again the way he used to be?"
She then quipped: "'He's so good looking. He better be attracted to me because he is something."
As well as her own body, the Colombian beauty - who recently replaced Christina Aguilera as one of the coaches on The Voice USA - was surprised by the initial appearance of her baby son and was shocked by just how traumatic labour is.
Shakira, 36, joked: "Delivering a baby is not as idyllic as people make it seem. Don't expect that he is going to be rosy cheeks, cherub when he is born. Actually, when I saw mine, I was like, 'Oh my God. He is purple and wrinkled. What is this?'