Turns out Britney Spears' now infamous OK! photoshoot on July 19 wasn't the only part of her very bad day documented for posterity. Britain's News of the World claims that hours after the newly minted ex-Mrs. Kevin Federline melted down during a doggie poop- and chicken grease-filled session with the magazine, she did the same while shooting a stripper-themed video that will likely make "Showgirls" look like "Citizen Kane."

Britney, who can't seem to grasp that a pitiable, tattered-tressed and obviously troubled mommy of two infants isn't exactly the epitome of hot and sexy, decked herself out for the pole-dancing-centered video shoot in a teeny leather vest, hole-y fishnets and a pair of Underoos that appeared to be making a desperate attempt to escape by heading due north.

Photos taken on the set seem to illustrate just how deep her denial runs (hint: it's deeper than Isaac Hayes singing the "Theme from Shaft" at the bottom of the Grand Canyon): Spears was snapped awkwardly bumping and grinding while sticking out her belly and doing some less-than-seductive squats.

The most heartbreaking shot from the unintentional comic strip shows the self-destructing, self-unaware starlet staring off into space -- dead-eyed and down-at-the-mouth -- while clinging to her couture-soiling Yorkie.

Of course, Brit's binding panties would be enough to make anyone cranky, but a spy on set gripes to the tab that she was also "completely uncooperative," "snotty," "rude" and "behaving like a complete and utter spoilt brat."

Spears was also supposedly "smoking like a chimney" and downing "can after can" of Red Bull.

The paper claims the already shaky (and dangerously caffeinated) situation imploded when Britney was called upon to make like Lindsay Lohan in her critical and commercial bomb "I Know Who Killed Me" and perform on the pole.

"You could see she was getting a bit wobbly but no one expected her to throw a complete fit," says the mole. "Suddenly she was in floods of tears and stormed off set. She eventually came back but was sobbing hysterically."

With the star's face stained with runny makeup and everyone's nerves likely at the breaking point, the director of the video wisely decided to cut things short around midnight, according to the tabloid.

"It was a total shambles," sighs the source. "She needs help fast."

Alas, Britney's troubles just keep mounting. In addition to her disastrous, paparazzi-pummeling trip to Las Vegas last week, there's her ongoing tussle with K-Fed over custody of Sean Preston, 22 months, and Jayden James, 10 months.

Still, instead of prudently lying low, Britney has kept up her usual schedule of shopping and club-hopping.

She reportedly spent part of Saturday house-hunting before hitting several L.A. hotspots with her young, male realtor in tow. On Sunday, paparazzi tagged along as she browsed an antique store.

Meanwhile, before Spears' Sin City getaway went south, was she being set up for a reunion with estranged mom Lynne and 16-year-old sister Jamie?

That's the word from Robin Leach's Luxe Life, which says Lynne and Jamie jetted into town to see Britney, but didn't make contact.

The failed reconciliation didn't seem to put a damper on their good time, however.

After spending the day by the pool at Caesars Palace, Lynne and Jamie dined at Social House before Mama Spears ventured out with some pals to nightclub Pure, where she reportedly sipped Dom Perignon and margaritas into the wee hours.

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