Miley Cyrus is a “pothead” and apparently she doesn’t care who knows it.

At least that was the “party line” at her private 19th birthday bash last week at the Roosevelt Hotel Beacher’s Madhouse Club in Los Angeles. In a video obtained exclusively by Flash, when Kelly Osbourne presents a cake to Cyrus emblazoned with the face of a ganja icon, the former “Hannah Montana” star cracks,

“You know you’re a stoner when friends make you a Bob Marley cake — you know you smoke way too much effing’ weed.”

“I thought salvia was your problem, man?” retorts Osbourne.

Osbourne’s quip was a jokey reference to the infamous bong video that surfaced after Cyrus’ 18th birthday party last year, in which Miley was caught smoking what she later claimed was the legal herb.

This year, Cyrus is apparently out in the open with her predilection for reefer, even with mom and dad — Tish and formerly estranged Billy Ray Cyrus — in attendance.

“Everyone in the room knows she’s a pothead,” our spy said.

Read the rest and check out the video here!