Photo Exclusive: Inside J.Lo's Big, Glam Bash!

See how Lopez surprised her husband Marc Anthony on his 40th birthday


If the morning's triathlon wore Lopez out, she didn't show it. The singer-actress hit the dancefloor in her Marchesa dress. "I didn't feel horrible," she said. "Just a little tired. I had a little headache, maybe it was the relief of the stress."

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