Brittany Murphy

: The darkness spreads

.

So one might title continuing coverage of the 32-year-old actress' tragic death - which gossip rags claim was caused by everything from anorexia to Xanax.

Authorities in Lalaland say an autopsy was completed on Monday, but results will be held pending completion of toxicology tests, which will take up to six weeks.

TMZ says police found a cache of prescription drugs at Murphy's house, but nothing illegal. Britain's Daily Mail hastens to note that one of the drugs, Vicodin, was "the same drug Michael Jackson was hooked on." (So are many others!)

CBS' journalistically sober and responsible Early Show yesterday invited forensic pathologist Dr. Cyril Wecht - who has never examined Murphy - to offer his deductions: "You can be sure that this is going to prove to be a case of acute combined drug toxicity. A tragedy."

Murphy's hub, Simon Monjack, is incensed by all the speculation.

"My world was destroyed" by her death, he tells Access Hollywood. Asked by People mag if drugs killed his wife, he said, "I can get rid of that one right now." And he says Murphy did not suffer from anorexia.

TMZ also says Murphy's estate will go to her mom, Sharon, because the actress made her will before she met Monjack.

Grammy Award warblers line up

Taylor Swift

, 20, who this week was voted the Associated Press' entertainer of the year, will perform at the Grammy Awards, the Recording Academy announced yesterday. The glitzy do, which will air live on CBS from the Staples Center in L.A. on Jan. 31, also will feature

Beyoncé

,

the Black Eyed Peas

,

Lady Antebellum

, and

Maxwell

.

Tidbits 'n' pieces

Kim Peek

, 58, a savant from Utah who inspired

Dustin Hoffman

's character in the '88 Oscar winner

Rain Man

, has died of a heart attack, his father,

Fran

, says.

Irish bookie Paddy Power (www.paddypower.com) says rocker Pete Doherty, who was arrested Monday for carrying drugs into a London court for a DUI hearing (?!), is its 8-to-11 favorite to be the first celeb arrested for drugs in 2010.

Jennifer Aniston-denier Bradley Cooper took Renée Zellweger on a movie date Monday. Pics at www.gossipcenter.com.

LeAnn Rimes, 27, and Deane Sheremet, 29, whose marital bliss died when Rimes began seeing Eddie Cibrian, have reached an undisclosed settlement in their divorce, which takes effect June 19, says People.

New Zealand TV host Paul Henry, who last month let loose a bucketful of abusive comments about Susan Boyle in a diatribe on his TVNZ Breakfast Show (she was not on the show), has apologized for calling the Scottish songstress "retarded."

Diamond expert and MyJewelryBox.com CEO David Mamane says after inspecting photos of Carrie Underwood's engagement ring (given by Mike Fisher), he believes the rock is at least 12 carats and is worth $1.3 mil. (Guesstimate sent to us courtesy of www.MyJewelryBox.com.)

Want to see Michael Jackson's much-anticipated FBI file? Visit www.fbi.gov/page2/dec09/jackson_122209.html.

From 'freak' to artist (and back)

"I used to get made fun of for being either too provocative or too eccentric. . . . I didn't fit in, and I felt like a freak," says

Stefani Germanotta

of her New York school days. SF, better known as fashion-schizoid popster

Lady Gaga

, tells In Touch Weekly that she became who she was (

herself

) in college: "I'm an . . . extreme dresser. . . . This is really who I am."

Contact "SideShow" at sideshow@phillynews.com. This column contains information from Inquirer wire services.