Lopez gets a visit from her 15-month-old daughter on the L.A. set of her new movie. Plus: Taylor Swift, Miley & Justin, Britney Spears and more

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HORSING AROUND

She may be playing dress up, but Britney Spears isn't playing around! The singer, who recently attended her cousin's wedding in Louisiana, gets back to work Thursday, shooting her latest music video at a Los Angeles-area polo field.