Within hours of hearing the news about her 16-year-old sister’s unexpected pregnancy, Britney Spears was going wild on the streets of Los Angeles.

The troubled pop star’s first stop was the Lisa Kline boutique, where Brit often shops when depressed. With her chihuahua in hand, the 25-year-old mother of two tried on a variety of short dresses and jeans. And while this might not strike one as odd, what the former Mrs. Kevin Federline told reporters as she left was certainly of note. "My sister’s not pregnant!" the "Gimme More" songstress exclaimed. Um… Is there another Spears sister we don’t know about?

But the odd behavior didn’t stop there. According to witnesses, Britney, who at best can be described as an often-confused driver, made several U-turns in rainy conditions Tuesday night, and at one point while driving west along Santa Monica Blvd., the pop star began to turn right and go north on Doheny Dr., only to change her mind in mid-turn and make a left-hand turn, cutting across three lanes of traffic in the middle of the intersection!

A few blocks later, Brit pulls into the swanky L’Ermitage Beverly Hills hotel, where she and her assistant hung out at the famous Writer’s Bar. In the bathroom, one eyewitness describes the pair as "thick as thieves," saying they were "sharing makeup and lipstick." After enjoying a beverage at the bar, Brit and her assistant sat down for some grub.

Just after midnight, it appeared as if Britney had decided to move on, pulling out of the L’Ermitage parking lot. But instead of heading to a nearby fave like the Four Seasons, Brit merely drove around the block before re-entering the hotel minutes later!

Well, if Britney wants to learn about her sister’s pregnancy, she can just head down to the hotel’s newsstand Wednesday morning and pick up a copy of the new OK!.

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