Britney Spears' day-long video shoot turned into an all-nighter on Tuesday because the pop superstar spent the day looking after her kids - and forgot to tell the production team. The Toxic singer was supposed to start work on the promo at Los Angeles' Social club early on Tuesday, but didn't appear until late in the evening.

A set source says, "She finally arrives at 9pm without the kids. The original call time for her was noon."

But Spears quickly made amends, working hard with her dancers.

The insider adds, "The people involved do not seem too bummed. They're all oddly upbeat."

The shoot wrapped at 8am on Wednesday.

-Britney Spears Pictures

(This news article provided by World Entertainment News Network)