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An eyewitness tells UsMagazine.com that Cox and Arquette were even affectionate while they attended their 6-year-old's horse show at Malibu Equestrian Park.
"David would wrap his arm around her, and Courteney rubbed his back," said the spy, of the couple who announced their split just one week ago.
The Scream 4 costars' reunion was extended even after the event was over, as the source says both Cox and Arquette took Coco back to Cox's Malibu home, where they celebrated the little girl's accomplishment.
"The thing they care most about is Coco," an insider said. "That's what they're saddest about. They don't want to do anything to hurt her."
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