See how Lopez surprised her husband Marc Anthony on his 40th birthday
Credit: Kevin Mazur/Wireimage
Updated: Thursday Sep 18, 2008 | 06:00 AM EDT
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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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