Conor McGregor and his fiancée, Dee Devlin, are adding to their family -- the UFC superstar just announced the couple is expecting their fourth child together!!
The former champ champ shared the big update on "LIVE With Kelly And Mark" Wednesday ... and he says they couldn't be more excited for the new baby.
34-year-old McGregor was talking about raising his three other kids -- Conor Jr. (6), Croia Mairead (4) and Rian (2) -- when he spilled the beans on the growing family.