Watch: Pregnant Cardi B Reacts to Boyfriend Stefon Diggs' Paternity DramaCardi B is speaking up. After the "WAP" rapper's boyfriend Stefon Diggs-with whom she is expecting her fourth baby-was accused of fathering model Lord Gisselle's 5-month-old child, Cardi responded in an Instagram Live video, referencing Shirley Brown's 1974 song "Woman to Woman," in which a woman reaches out to her partner's mistress. "That's your baby daddy, b---h?" Cardi asked in the Sept. 20 stream, per Page Six. "That's my baby daddy, too.