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Rex Features
McCartney reportedly arrived at Mills' home at 6pm without any explanation, after earlier agreeing to bring her back between 2pm and 5pm.
According to The Mirror, Mills had family and friends waiting to see her 2-year-old daughter and was not impressed at McCartney turning up late.
A source commented: "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."
Custody of Beatrice will be decided in court in February.
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