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Adopt-A-Minefield Goodwill Ambassador Heather Mills McCartney arrives for the Adopt-A-Minefield fifth annual gala in Beverly Hills, California November 15, 2005. Mills McCartney and her husband Paul McCartney hosted the event. (UPI Photo/Jim Ruymen).

LONDON, Dec. 31 (UPI) -- British rock icon Paul McCartney and his estranged wife Heather Mills reportedly had a post-Christmas spat after McCartney took their daughter home late.

The argument began after McCartney failed to take 4-year-old Beatrice home at the designated time last Wednesday, leaving family and friends waiting to see the girl, the Daily Mirror reported.

"They arranged for him to have Bea between 2 p.m. and 5 p.m., but he didn't arrive until 6 p.m. and didn't even ring to let her know he was running late," a source told the newspaper.

"Heather wasn't happy. She had people round to see Bea and it didn't leave much time until she had to be in bed. She made it patently clear she wasn't happy. She thought it was incredibly inconsiderate and rude."

The former couple are scheduled for divorce court in February. Sources told the Mirror custody will be a key issue in the case.