Front Row at Chanel

Katy Perry, Rita Ora and Kate Upton attended the show, staged on a massive art gallery set.

Inès de la Fressange

Inès de la Fressange

Photo By Stéphane Feugère

PICASSO BABY: The larger-than-life art gallery set of Karl Lagerfeld creations at the Chanel show in Paris had Katy Perry ready to pull out her credit card. The singer took a shine to a sculpture of two giant quilted Chanel handbags. “Can you see if that’s for purchase?” she asked an assistant. “I didn’t know it was for purchase, but I see a lot of red dots on everything already.”

It turns out the singer has developed something of a Chanel habit. “It’s really the only thing that I splurge on, labelwise,” she said. “I’m into vintage Chanel, so I’ve been doing a lot of 1990s hunting.” Perry also hopes to don the label in the video for the next track from her album “Prism,” coming out this month.

“There’s a lot of positivity and anthems, and hope and joy,” she said of the record. “The reason why I called it ‘Prism’ is because I let a lot of light into my life, which was necessary, because I was in a darker place.”

Rita Ora has also been recording. “I’m working on my second album. It’s pop-based, but with a lot of soul — what I’ve wanted to do for ages. And thank god, my boyfriend’s amazing,” she said, referring to DJ Calvin Harris.

Ora revealed her upcoming makeup line for Rimmel London would include her signature bright red lipstick, but also softer shades. “I’m going to definitely open it up, because not the whole world wears red lipstick — even though that’s my aim,” she said. “I love the fact that I can do something that’s just affordable and easy to reach.”

Tuesday’s show, staged in the soaring glass-and-steel Grand Palais, drew guests including Kate Upton, Stacy Martin, Vanessa Paradis, Virginie Ledoyen, Zoë Kravitz, Rila Fukushima and Lou Doillon.

Upton enthused about shooting her first film, “The Other Woman,” opposite Cameron Diaz. “I’m the other, other woman,” she said of her role. “This man gets around.” The model has been taking acting classes for two years. “It’s a craft and you have to learn it,” she said.

Martin is also making her first steps in film, in controversial director Lars von Trier’s upcoming “Nymphomaniac,” no less. “It was very overwhelming,” she said of the experience. Despite her clipped British accent, it turns out the actress is half French. “I was born in Paris. I blend in very easily — it’s my trick,” she said.

Kravitz said she was heading to Australia for reshoots on “Mad Max 4: Fury Road,” adding that the movie should satisfy fans of the franchise. “The costumes are insane, Charlize Theron looks amazing — it’s going to be really incredible,” she said. The daughter of rocker Lenny Kravitz is also planning to release an EP with her new band, Lolawolf, in November.