Stephen Lovekin/WireImage

WHAT SHE WORE Blake Lively attended the opening of Gaga's Workshop at Barneys New York in a slim Elie Saab suit and pave jewelry.

WHY WE LOVE IT Peek-a-boo lace panels and a bright hue amped up the actress's high wattage design.

CELEBRITY: Blake Lively

DESIGNER: Elie Saab

TREND: Blue

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Blake Lively

Blake Lively in Elie Saab

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