The Palin circus is open for business!

The Anchorage Daily News reported yesterday that Levi Johnston, 19, has won an early victory in his custody battle with ex-gf Bristol Palin over their son Tripp, who turned 1 on Sunday. Levi, all pumped up from his triumphal Playgirl pictorial, had filed to make the proceedings and all court documents public.

Alaska Superior Court Judge Kari Kristiansen sided with Levi and against Bristol, who wanted to keep the case confidential. One imagines she also wants to protect her mum, former Alaska Gov. Sarah Palin, who has been embroiled in a few mudslinging contests with Levi.

On Nov. 4, Bristol filed for custody of the child, claiming that "Levi is not yet mature enough to take on significant parental responsibilities." She also seeks court-ordered child support - from an unemployed high school dropout. Nice!

Levi seeks shared custody. In an affidavit, he says he wants the case to be open to "public scrutiny as a check against anyone's need to be overly vindictive, aggressive or malicious." He adds that he's referring not to Bristol but to her mom.

Sarah, he says, "is powerful, politically ambitious, and has a reputation for being extremely vindictive." Bristol told the court "my mother is not involved in this case." She also said Levi wants to use the case to publicize a potential reality show.

This week with the Kardashians

Mason Dash Disick

, beloved newborn son of American sweetheart

Kourtney Kardashian

, 30, and

Scott Disick

, 26, has made his mag-cover debut in Life & Style Weekly (

). Congrats, Mason! (No word on how much ca$h he got for the cutie-pie pose.)

Inside, KK says it "feels amazing" to be a mom. "It's just so indescribable. You don't get how good being a parent feels until it happens to you." KK, who delivered her son Dec. 14, says the labor "was surprisingly easy and just an incredible experience."

Kardashian: Of monkeys & cookies

Kourtney's sis,

Kim K.

, also had fun with a tiny - albeit furrier - creature. Yesterday on her Web site (

), Kim said she was visiting

Ashton Kutcher

on his film set when a magician dude named

Dynamo

made a lil' monkey appear out of thin air. "I thought he was really cute at first," she writes, "but then he [urinated] on me!!"

Kim's having a bad week: RadarOnline says Matthew Siegal, CEO of Dr. Siegal's Cookie Diet, yesterday filed a lawsuit in Miami-Dade County, Fla., accusing Kim of bad-mouthing his diet. It started when Kim tweeted that the company falsely claimed she endorsed the brand and she went on to call it "unhealthy."

Tidbits 'n' pieces

Hangover

star

Justin Bartha

is Broadway-bound. CNN.com says the thesp has been cast in

Stanley Tucci

's revival of

Lend Me a Tenor

starting in March. He's replacing former

Grey's Anatomy

doc

T.R. Knight

, who dropped out, according to Variety.

The Young, Black and Fabulous gossip blog (http://theybf.com/) says actress Gabrielle Union (Cadillac Records, FlashForward) has taken her romance with b-ballplayer Dwyane Wade public: The two were spotted being all canoodly Monday before DW's Miami Heat game.

Lil Wayne, who on Feb. 9 will be sentenced, very possibly to jail, on weapons charges, said farewell to his fans with a concert Monday night in New Orleans. "I'm nothing without you," he said to the thousands-strong crowd.

Carrie Underwood had a great Christmas, she posts on her Web site (www.carrieunderwood.fm/). "I think you all know what Santa left under the tree for me this year ... a fiance [NHL player Mike Fisher]! Woo hoo! Little Ace is finally going to have a dad!" she writes, referring to her dog.

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