ENERGY PILL: Guests at the Louis Vuitton show Sunday rallied around to offer pick-me-up tips for tired fashion folk. “David Kirsch’s vitamin supplement packs are the best. I love the Thermo Bubbles one with natural green tea,” said Kerry Washington. Meanwhile, a preppy Antoine Arnault was sandwiched between a tank-topped and tattooed Lenny Kravitz and hirsute French rocker Sebastien Tellier, who offered less conventional remedies. “Lots of bananas — and ice skating is always a good way to revive the spirits,” said Tellier, who is recording his next album. Susan Sarandon’s daughter, Eva Amurri, had her hair swept in a sophisticated quiff. The actress is next shooting alongside Josh Lucas in a dark comedy about a family-run pharmaceutical company. First up, though, is a family affair. “My dad [Franco Amurri] turns 50 next week so we’re having a big party. My mom’s organizing it, but she has so many things to do so I’m helping,” she said. French actress Hélène de Fougerolles, meanwhile, has a trio of movies out by the end of this year, including “Mutants,” a horror movie. The actress has also turned author, having penned a children’s book for her five-year-old daughter. Donna Summers’ daughter, Amanda Sudano, said she was taking time out from recording her new album, “5-8.” “I’m looking forward to doing some sightseeing and this is a good way of spotting outfits for my concerts,” she said, adding that she’s in talks to be featured in a few undisclosed Spanish brands’ campaigns.