Blake Lively or Melanie Fiona: Which celeb rocked the party dress look?

Blake Lively is shaping up to be one hell of a fashionista. I know, I've done 2 posts on her in under 2 days. Girlfriend is seriously killing the red carpet game. I saw a picture of her rocking a gorgeous pink Lanvin dress and did an immediate double take. Hot on her heels though is singer Melanie Fiona who equally slayed in an envy-inducing blue dress. I love both looks so I decided to do a fashion face-off, which look do you like the best?