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

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

SHOCK AND 'AWW'...

And Anthony never suspected a thing. In fact, Lopez had told her husband they were flying to New York to dine with pal Katie Holmes. "My favorite moment was as we walked in," Lopez said. "Marc was in shock. It made my knees go weak. He was so happy."