If this is a day ending in "y," it must mean Britney Spears is up to her doll hair back-to-platinum tresses in hot water. Over the last few days, the sense-challenged mommy of two has reportedly had her maternal instincts questioned, received the third degree from the cops and been called out by an animal advocacy group.

And somehow, she still found time to squeeze in yet another hotel rendezvous with Criss Angel. Here's a breakdown of Britney's latest doings:

There's a new twist in the escalating custody battle between Spears and ex-husband Kevin Federline, who is attempting to gain primary custody of Sean Preston, 23 months, and Jayden James, 11 months.

TMZ.com reports a hearing was held on Monday in Los Angeles over a complaint relating to the care of the chubby-cheeked tots.

The allegations are said to concern the kids' eating and sleeping habits, along with their dental hygiene (the tabs have claimed Britney tried to whiten Sean's teeth and may have put soda in their bottles).

The Los Angeles County Department of Children and Family Services, which previously paid a visit to the family in April 2006 after Sean took a tumble from his high chair and cracked his noggin, is investigating, says TMZ.

The disquieting news caps off yet another whirlwind weekend of oh-so-worthwhile pursuits for Britney.

On Thursday night, she hit Los Angeles hot spot Opera, where People reports the fedora- and velvet short-short clad starlet was bopping along to the music, with a drink in hand and a smile on her face.

At 2 a.m., Brit exited the club and made a beeline -- with similarly clad minions in tow -- to Angel's hotel, says photo agency X17, which spotted the gruesome twosome repeatedly popping onto a balcony for a smoke break.

The nicotine buzz apparently took a while to wear off. X17 claims Spears didn't leave until 9 a.m. the next morning.

Still, the hirsute, PR-courting illusionist continues to insist he's merely consulting with the meltdown-prone former popster about her rumored performance at the MTV Video Music Awards on Sept. 9.

He tells the Las Vegas Review-Journal that they're "just friends" and are discussing adding a magical element to what some are speculating (hey, don't look at us) will be a debacle of epic proportions.

"We've talked about it," he tells the paper. "I just don't know if we're going to have enough time to pull it together with our schedules."

So, what else was packing Britney's seemingly busy datebook last weekend?

A little past midnight on Saturday, she was zooming down a freeway near downtown Los Angeles, ostensibly on her way to Sin City to meet up with Angel, when she and the pair of dancer-pals she was with were caught by the long arm of the law.

According to People, Spears was nabbed for driving her new white Mercedes convertible erratically, a problem she blamed on the paparazzi who were trailing her.

Despite reportedly cruising along for nearly a mile before pulling over, Britney was let off with only a warning. She quickly had one of her hangers-on get behind the wheel as they headed back toward Los Angeles.

Spears wisely stuck to the passenger seat while out on the town the next night, an arrangement that conveniently freed up her fingers to give a one-digit salute to shutterbugs.

That same gesture was likely her reaction to the Society for the Prevention of Cruelty to Animals. TMZ.com reports an SPCA rep stopped by Brit's Beverly Hills mansion on Friday after receiving numerous concerned calls about her Yorkie puppy London, who has recently been spotted with a cast on his leg.

"The matter is not if the dog had an accident, but if the dog is getting proper care," said Los Angeles SPCA prez Madeline Bernstein, who was only able to leave a message with the housekeeper.

But the SPCA quickly dropped the investigation after interviewing Spears' staffers and receiving a note from her vet. The animal advocacy group concluded that the canine's injuries were minor and accidental.

"As it turns out, Britney wasn't there when the dog mishap occurred," Bernstein tells Us Weekly, adding that her sons also weren't involved. "The dog got under someone's foot in the walk-in closet. It's not that unusual for people to step on their dogs by accident or trip over them. Things like this can happen."

Besides the scrutiny from child services, the police and pooch patrol, it was the same-old, same-old for the Britster last weekend, with photographers snapping her shopping (for clothes and groceries), going for a tanning session, club-hopping and hanging out at home with Sean and Jayden.

Alas, her family time on Sunday wasn't without incident. Privacy-invading photographers caught a bikini-clad Spears holding a lollipop cigarette very close to the face of a nekkid Sean P.

Although it's unclear whether the cancer stick was lit, the photo will likely provide even more ammunition to Federline's attorneys, who have been serving subpoenas to Brit's inner circle.

(If Kevin really wants to impress the court, he should give up his own secondhand smoke-producing habit immediately.)

K-Fed, for his part, jetted off on Thursday to the Wilmington, N.C., set of "One Tree Hill," on which he'll play against type in a recurring role as a successful rocker.

Federline apparently arranged for some quality childcare during the two days he was gone. On Friday, paparazzi caught the tots cracking rare smiles outside Kevin's rented mansion as Britney's divorced parents, Lynne and Jamie, pushed them around in toy cars.

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