Kieran, from County Wicklow in the Republic of Ireland , had been celebrating a friend's stag in Cork, 150 miles from home, before he realised his predicament.
The happy couple enjoyed a night off from parenting duties as they attended the Oscars, where they witnessed Macaulay's younger brother Kieran win the award for Best Supporting Actor.
Macaulay Culkin had a emotional reaction to his little brother Kieran winning the Academy Award for Best Supporting Actor Sunday night. 'I cried,' the Home Alone star, 44 said.
Kieran Culkin delivered an emotional, expletive-filled acceptance speech as he became a first-ever Oscar winner - but left out a very famous family member.
Kieran - who had made sporadic hit with roles in the likes of Father of the Bride, She's All That and Scott Pilgrim vs. the World - is now finally being recognised centre stage in Hollywood.