By Ann Hornaday

CANNES - Not content with stealing the show at the "Star Wars: The Force Awakens" press tour and last month's White House Correspondents Dinner, Carrie Fisher's French bulldog Gary Fisher took Cannes by storm on Saturday night, patiently posing for the paparazzi on the red carpet before the world premiere of "Bright Lights: Starring Carrie Fisher and Debbie Reynolds," a documentary about his human mom and grandmother.

The next day, Gary was relaxing at the Majestic Hotel, where he shared a bowl of vanilla ice cream with Fisher, who chatted with a reporter while taking turns spooning the delicacy into the dog's mouth, then hers (with the same spoon). "They say ice cream and something else, I think it's peanut butter, are the things for depression," said Fisher, who has been diagnosed with bipolar disorder. Visibly tired after a day of doing press, she added, "I feel like I've drained my personality out of a hole."

Still, Fisher was happy about how "Bright Lights" had been received the night before; the film received enthusiastic reviews as an intimate, sometimes painfully honest examination of fame, family, aging and mother-daughter dynamics that, in Fisher and Reynolds's case, haven't always been smooth. She wanted to make the film, she said, because Reynolds - who still performs her nightclub act when she's up to it - had begun to decline, physically and cognitively.