Sideshow: Miley's man a wanderer?

OK, so what, please, is Liam Hemsworth doing? Better question: Exactly how big of a skunky, slinkin'-around, faithless dog is he, going out behind his fiancee Miley Cyrus' back? You may recall that the two broke up back in summer 2010 over his rumored infidelities and infelicities. That healed. But now . . . if Life & Style Weekly is to be believed, Liam and the voluptuous voluptuary January Jones (Mad Men) had a little too much fun, and face, and booze, at a Feb. 23 Chateau Marmont pre-Oscar knees-up in L.A. Witnesses waxed quite skunky on JJ. Guest says: "She was wasted; it wasn't good." Source explains: "When it comes to men, January just goes for it."

Two longtime against-the-grainers, Oliver Stone and Sean Penn, mourned the stepping-across Tuesday of Venezuelan leader Hugo César Chávez. "I lost a friend I was blessed to have," said Penn. Stone, whose 2009 flick South of the Border was nice to Chávez, called him "a great hero to the majority of his people." Meantime, ardent Chávez hater Ted Nugent, who's good at hating, said, "ADIOS [INAPPROPRIATE EPITHET]."

In a case thought to be the first of its kind, a major music joint is suing someone for pre-leaking an album. Sony seeks damages, as in $233,000, from a Swedish guy for digitally leaking Beyonce's album 4 to the site Pirate Bay in June 2011, ahead of the album's release date. It's not suing him for the leak itself but for hurting them and Beyoncé, businesswise. They had the guy's Internet behavior tracked, in a bit of 21st-century sleuthing.

Valerie Harper, so good as Rhoda Morgenstern on The Mary Tyler Moore Show that Rhoda became o ne of TV's earliest spinoffs, announced Tuesday that she has a rare and incurable form of brain cancer. Jaw numbness during rehearsals for her one-woman show, Looped, sent her to the doctor, and soon she pulled out of the national tour. She's having chemo, but may have only months left.

Wait . . . Why is Taylor Swift ticked at bffs Amy Poehler and Tina Fey? Oh, yeah: Because at the Golden Globes on Jan. 13, they riffed on Tay-Tay a little dishily. Tay's still burnt! To Vanity Fair she quotes Katie Couric: " 'There's a special place in hell for women who don't help other women.' " At the premiere Tuesday of Admission, Poehler talked back to Hollywood Reporter: ". . . I do agree I am going to hell. But for other reasons. Mostly boring tax stuff."

Lamar Odom, or Mr. Khloé Kardashian, is in a truly bad custody battle with Liza Morales (Starter Wives Confidential), baby mama of his kids, Destiny, 14, and Lamar, Jr., 11, as well as Jayden, who died of SIDS in 2006. Pics released Tuesday show him fast asleep on a bench in the court hallway. . . . Universally desired Adam Levine, front hunk of Maroon 5, is said to be avidly dating Amanda Setton (Gossip Girl). . . . Director Sam Mendes says nyet to another James Bond flick. . . . Be happy for Holly Madison (Girl Next Door; sometime Hugh Hefner skweezie), who delivered a girl baby via baby daddy Pasquale Rotella on Tuesday. And while we're at it, let's smear some thick happy-frosting on Katherine Kallinis Berman (DC Cupcakes), who gave to the light a daughter, Isis Sidney Berman, by husband Ben. She recently opened an L.A. branch of her cupcakes empire. Why Isis? She's named after KKB's favorite Bob Dylan tune. . . . Rihanna, master of the risqué Twitter self-pic, shot out spasmodically to her 28,665,563 followers, has outdone even herself, pornographically speaking. She celebrated the purchase of a new pair of custom Prada kick-me-dead thigh boots by snapping herself, from behind, clad only in a suggestion of a thong. The look of contemporary celeb marketing! . . .  Remember Edward Furlong, the teen John Connor in Terminator 2? Us neither, but he's been busy. There's a protective order so he doesn't go near his former gf, Monica Keena, restraining orders on behalf of both Keena and Ed's estranged wife, Rachael Bella, and now . . . he gets 180 days in the slammer in L.A. for violating parole. Where's Arnold Schwarzenegger when you need him?