Grunge rock is never over when you are the daughter of Kurt Cobain ...

Frances Bean Cobain, who looks thinner than we've ever seen her, and her longterm boyfriend, Isaiah Silva, landed at LAX on Monday night looking like they stepped out of the "Smells Like Spirit" music video. The only thing missing is a plaid shirt!

A stringy-haired Frances and her main man were paying tribute to her father's famous era by rockin' some seriously '90s gear at the Los Angeles. The rock progeny donned a Dolly Parton t-shirt, while Isaiah held '90s-strong with a Beavis and Butthead shirt.

Over the weekend, Frances and her famously flawed mother, Courtney Love, reunited in public for the first time in more than 5 years. Despite the estrangement, the pair were all smiles for the camera at Saturday's world premiere screening of the upcoming Kurt Cobain documentary, Kurt Cobain: Montage of Heck at the Sundance Film Festival.