He wrote, "On a plane back to NY. Praying Dem Babies wait for DADDY to come back b4 they pop out (sic)!"
But Mariah Carey's rep insists the dad-to-be has got nothing to worry about - the singer is not in labour.
The Hero hitmaker was briefly hospitalized at the weekend (26-27Mar11) after experiencing contractions on Saturday night.
Mariah Carey is expecting twins in May (11).