Nirvana: Grohl, Cobain, and Novoselic; McCartney. (Jeff Kravitz/Film Magic)Nearly 20 years after Nirvana ended with the suicide of singer Kurt Cobain, the band will be back together for one night … but not with the help of a hologram. None other than Sir Paul McCartney will reportedly fill in for the late grunge god and be backed up by Dave Grohl on drums, Krist Novoselic on bass, and unofficial member Pat Smear on guitar for a performance at the Hurricane Sandy benefit in New York City on Wednesday night. Although the news began as speculation, McCartney's publicist would neither "confirm nor deny."

Miley Cyrus (Getty Images)Miley Cyrus still can't be tamed.

The 20-year-old put on quite a show Saturday during Israeli electronica DJ Borgore's "Christmas Creampies" concert at the Fonda Theatre in Hollywood. Appearing as a surprise guest performer, Liam Hemsworth's fiancée hit the stage after midnight and showed some serious skin while singing and dancing with a topless stripper.

Christina Aguilera (Getty Images)Christina Aguilera has always scored points in our eyes for being candid — when it comes to her music as well as in her personal life — but lately, instead of being open, it seems she's become guilty of oversharing. We're still recovering from her October appearance on "Chelsea Lately," in which the mom of 4-year-old son Max revealed her dislike of panties. "I don't wear underwear," she offered. "I like to be as free as possible at all times. It's just who I am."

Katy Perry, Christina Aguilera, Usher, and Adele. (WireImage/Getty Images/FilmMagic)There were so many great songs that hit the radio airwaves this year, and now there's a way to enjoy them all in just eight minutes. Daniel Kim, a Vancouver-based deejay and photographer, has spent the last three months painstakingly selecting, organizing, and mashing up the top 55 songs from this year — including Carly Rae Jepsen's "Call Me Maybe," Adele's "Set Fire to the Rain," Katy Perry's "Part of Me," and One Direction's "What Makes You Beautiful" — into a neat little package.

Beyonce. (Kevin Mazur/WireImage)Beyonce is baring all in her upcoming HBO documentary. The usually private "Love on Top" singer released the trailer for the still-unnamed special on Monday, and although the 25-second clip is brief, it does give a glimpse of what fans can expect come February 16: lots of behind-the-scenes action … including a shot of her pregnant belly!

Dolly Parton. (Pacific Coast News)No, Dolly Parton hasn't been living a lie for the last 46 years. On Monday night's "Nightline," the country icon, who has been married to the rarely seen Carl Dean since 1966, addressed rumors that she's gay, rumors that have stemmed from her close relationship with longtime best friend Judy Ogle.

"Judy and I have been best friends since we were like in the third and fourth grade," she says in the interview with Juju Chang. "I mean, I love her as much as I love anybody in the whole world, but we're not romantically involved."