Sean O'Neill/

WHAT SHE WORE Blake Lively attended Target's Toronto launch in Roland Mouret's printed cocktail dress, Jennifer Meyer jewels and floral Christian Louboutin pumps.

WHY WE LOVE IT Nothing says "spring" like the actress's pretty multi-colored iris motif.

CELEBRITY: Blake Lively

DESIGNER: Roland Mouret

TREND: Prints

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Blake Lively

Blake Lively in Roland Mouret