Oops! She's in Rehab Yet Again Britney Spearschecked back into an L.A. rehab center yesterday, her manager confirmed -- a day after she abruptly fled the same clinic. It appears to be her third attempt at rehab in a week, including an aborted stay at a center in Antigua. The dramatic ups and downs of the 25-year-old pop star -- including her bizarre episode of shaving her head bald in front of paparazzi last Friday -- sent cable TV news bookers looking for wisdom from one expert: Danny Bonaduce. The former "Partridge Family" child star, who has had his own struggles with drugs and alcohol and bared his tumultuous recovery process in the VH1 series "Breaking Bonaduce," this week told CNN, MSNBC and Fox about rehab strategies and showed off the "5/3/95" tattoo commemorating when he first quit drinking. (He relapsed within weeks, he says.) Spears, he says, got the same room he once had at Promises, the ritzy Malibu rehab center.

Still, we wondered: Does fame make it harder to go sober? Can you really do the personal work with everyone watching?

"In some ways, I bet it's easier," Bonaduce, now a Los Angeles-based radio host, told us. "Everywhere I go, people are looking at what I'm drinking. . . . I've had people come up and stick their finger in my drink and taste it and say, 'Oh, okay.' Britney's going to go through this, especially since fans don't believe anyone's really taking care of her. Who wants to be the bartender who pours her a double shot?"

As a recovering alcoholic, Bonaduce, 47, said he'd do anything to help Spears. "I'll come pick her up and take her where she needs to go. She can come stay at my house." But he scoffed at the wistful notion that we should just all leave her alone.

"She doesn't have a right to privacy," he said. "She sold it" to anyone who ever bought an album. "I thought all I wanted was privacy until I got some. Overrated!"

No Tender Mercies for One Particular Movie Critic In this corner, Oscar-winning actor Robert Duvall. Across the ring, The Post's Pulitzer Prize-winning movie critic Stephen Hunter.The screen legend, who lives in Virginia, gave an interview in the new issue of Premiere magazine in which he blasted several movie critics -- especially Hunter, whom he calls an "idiot," a "jerk" and "a corpulent philistine from Kansas City."

"Absolutely true," Hunter told us. "But at least I didn't direct 'Assassination Tango.' "

Hmmm . . . sounds like a joke between old pals. "If it is, I missed it," says Hunter, who has written about Duvall, exchanged friendly e-mails and doled out respectful but not always glowing reviews of his projects. Turns out the actor is upset about our colleague's take on Mel Gibson's"Apocalypto" -- Hunter sort of liked it; Duvall calls it "maybe the best movie I've seen in 25 years" and thinks it should get the Oscar for Best Picture.

Okay . . . but "philistine"? Duvall had no further comment, said manager Brian Ferrantino.

Tools of the Trade: Hobnobbing and Hard Hats Hard hats and flats: Not the usual look for ladies who lunch. But Lady Catherine Manning, wife of the British ambassador, invited a group of Washington's movers (including Ann Nitze, Lucky Roosevelt, Alma Gildenhorn, Beth Dozoretz and Samia Farouki) for lunch at the ambassadorial residence yesterday and a construction tour of the Shakespeare Theatre's new Sidney HarmanHall, which opens Oct. 1. The women scrambled over cables for the VIP tour -- led by the theater's Michael Kahnand Nick Goldsborough-- and debated who might donate what to finish off the $87 million space. Anybody got a spare concert grand piano lying around? THIS JUST IN . . . The Capitol Pachyderms, America's D.C.-based elephant polo team{vbar}http://www.washingtonpost.com/wp-dyn/content/article/2006/08/18/AR2006081801407.html, finished second in last week's Ceylon Elephant Polo Association's Taprobane Trophy Tournament in Sri Lanka, after a tie and penalty shootout against the Aussie team of Tickle and the Ivories. The rookie Yanks made their debut in Thailand last fall{vbar}http://www.washingtonpost.com/wp-dyn/content/article/2006/09/09/AR2006090901065.html and are now among the favorites going into November's world championships in Nepal. Yes, that's right: elephant polo.