United Kingdom, March 22 -- Macaulay Culkin's wife-to-be has criticised Alaska Airlines for "giving away"their seats -despite the family booking spots together months in advance.

The 45-year-old Home Alone actor's actress fiancee Brenda Song, 37, said she had arranged first-class tickets for a family trip with her fiance Macaulay and their sons Dakota Culkin, four, and Carson Culkin, three, but alleged the airline reassigned their seats without warning.

Writing on Instagram, Brenda said the incident occurred as the family prepared to travel to celebrate Dakota's birthday.

She said: "I didn't know when you book your first class tickets 6 months in advance for your family. @alaskaair can just give away your seats the morning of with no w...