Stevie Wonder -- Only 1 Kid In Sight ... Triplet Story Not True

Stevie Wonder says he's not a triple threat ... but he is a single threat in the baby dept. ... he's having 1 kid -- not 3.

It was widely reported Tuesday that Stevie and his girlfriend Tomeeka Robyn Bracy are expecting triplets but Stevie's rep tells us it's just not true. She's pregnant with 1 child ... a girl due in December who'll be named Nia.

Stevie will add the new addition to his fold of 8. His kids range in age from 1 to 39.

Congrats!