Miley Cyrus smokes "way too much weed"

Just when we thought Miley Cyrus was on the straight-and-narrow, here comes a new rumor about her love of marijuana — and it's coming directly from the superstar's mouth!

Cyrus was celebrating her 19th birthday at the Roosevelt Hotel with her family and friends — including Billy Ray Cyrus, Kelly Osbourne and Victoria Justice — when she took to the microphone.

"You know you're a stoner when friends make you a Bob Marley cake — you know you smoke way too much [expletive] weed," she joked in the video, obtained by The Daily. The cake reportedly included a graphic of the late singer's face.

"I thought salvia was your problem, man?" joked Osbourne, referring to another video that caught the actress and singer taking hits from a bong. She later claimed it was the legal substance,  salvia.

She's apparently not quiet about her love of the green stuff these days. "Everyone in the room knows she's a pothead," a source said.

However, Osbourne took to Twitter to blast the so-called friend that leaked the video to the iPad-only newspaper.

"[L]et me make something very clear after @MileyCyrus salvia incident we started calling her bob miley as a JOKE! the cake was also A JOKE!" she tweeted. "[I]t makes me sick that @MileyCyrus so called 'friends' would sell her out and lead people 2 believe she is someone that she is not!"