By Darren Franich
Updated November 27, 2011 at 11:11 PM EST

Last week Miley Cyrus celebrated her 19th birthday party. In a video from the event obtained by The Daily, the singer thanks her friends and makes reference to the cake, which features an image of Bob Marley. Cyrus jokes: “You know you’re a stoner when your friends make you a Bob Miley cake. You know you smoke way too much f—ing weed.” Friend Kelly Osbourne then says, “I thought salvia was your problem, Miley!” (That’s a reference to a minor controversy from last year, when Cyrus was caught on video smoking the drug salvia.)

In response to the uproar over the new video, Osbourne took to Twitter: “let me make something very clear after @MileyCyrus salvia incident we started calling her bob miley as a JOKE! the cake was also A JOKE! it makes me sick that @MileyCyrus so called ‘friends’ would sell her out and lead people 2 believe she is someone that she is not!” Osbourne later added: “u guys if @MileyCyrus is not recording/filming/touring she is works everyday how could she possible do all that if she was a stoner! #think”

Update: A rep for Cyrus echos Osbourne, telling EW that the cake was indeed a joke and that Cyrus was only being sarcastic in response.