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Halle Berry, Pregnant, Brazil

Jason Merritt/Getty Images; GADE/AKM-GSI; Jennifer Graylock/Getty Images; Michael Buckner/WireImage

With the weather warming up, our favorite stars are looking hotter than ever!

This week presented numerous opportunities to dress up and dazzle the crowd, and leading ladies like Katy Perry and Selena Gomez didn't disappoint in playful black cocktail dresses with gorgeous, feminine details.

Ashley Tisdale smoldered on the Scary Movie 5 premiere red carpet in a slinky black evening gown by Maria Lucia Hohan featuring a plunging neckline and sexy cutouts, while Halle Berry showed off her adorable baby bump in a curve-hugging lace design by Monique Lhuillier.

But perhaps our favorite fashion moment of the week was Olivia Palermo 's cheerful ensemble by Katie Ermilio: a vibrant yellow evening gown featuring cap sleeves and a high-low hemline accessorized with a dazzling Zara chain belt, Jimmy Choo heels and a luxe animal print clutch. 

Palermo consistently amazes us with her ability to pull an outfit together with such effortless panache!

Who gets your vote for best dressed this week?