Brit's Video Bad Behavior

Britney Spears was almost a no-show at last week's shoot for her song "Pieces of Me." The train-wreckin' pop princess was up to her usual unreliable self -- keeping dancers and hair and makeup people waiting for more than 12 hours, according to Page Six.

But rather than scrap the set completely, Spears' record label, Jive, decided to give the shoot to a rising star on the label, Samantha Jade, to shoot her new single, "Eyes on Me."

When Spears found out her $500,000 shoot was being given to someone else, she flipped out -- and finally decided to show up.

Said a source, "Britney finally showed up when she realized a new, younger, hotter girl would take her slot."