Britney Spears was spotted shopping at a liquor store with a friend before allegedly causing a scene at a Los Angeles restaurant Wednesday night. Surveillance footage obtained by the Daily Mail Thursday showed the Grammy winner jumping out of a Mercedes Benz G-Wagon and heading into Wines of the World in the Sherman Oaks neighborhood of Los Angeles. Spears walked around the store and appeared in good spirits as she and her pal headed to the fridge sections. Britney Spears was seen on camera visiting a local liquor store with two friends before her “chaotic” knife wielding display at Blue Dog Tavern on Wednesday night. (A photo of her at the restaurant is seen above.) TMZ Surveillance footage taken Wednesday night showed the pop star hopping out of her Mercedes Benz G-Wagon before entering a Wines of the World store (one of which is pictured above). Google The “Gimme More” singer’s friend grabbed a canned beverage before making his way to the front to pay.…