Osbournes’ 15 minutes may be up

? There’s some bleepin’ bad news for the Osbourne family: Television viewers may be getting sick of them.

Ratings for MTV’s hit “reality” sitcom have been tumbling in its second season, from a high of 6.6 million viewers for its Nov. 26 premiere to 3.5 million Jan. 14. This week’s episode climbed back to 3.8 million.

Ozzy, Sharon, Kelly and Jack Osbourne also served as hosts of last week’s American Music Awards, which suffered its worst ratings ever.

Less than a year after “The Osbournes” began airing and the family became ubiquitous, are the Osbournes burning out?

“The people came in, they tried it and they just haven’t gotten back on it,” Harry Keeshan, senior vice president of broadcasting for the ad-buying firm PHD, said Thursday. “I don’t think a lot of these people will return.”

The show’s tone is different this second season because the family’s life is different.

Instead of showing the eccentric home life of a marginal celebrity and his family, the latest episodes depict them coping with sudden fame, as well as Sharon’s bout with cancer.