This week was all about sleek sheaths and power pleats. And the winners are...

Ana de la Reguera in Gucci at the "Cowboys & Aliens" World Premiere in San Diego. The actress looked gorgeous in this romantic gown which, for me, gives off a "Gone With the Wind" vibe. It has also been worn by Beyonce.

Kelly Rowland in Cushnie Et Ochs at the "Here I Am" Album Launch Party. This cutout dress served as the perfect display case for Kelly's rockin' bod. I only wish she'd opted for a different, and less noisy, pair of shoes.

Olivia Palermo in DKNY at the DKNY Sun Soiree. The blocks of color and allover pleats really play well together in this dress. I also like how Olivia didn't shy away from bold accessories when it came to completing her look.

Heidi Klum in Yves Saint Laurent for an appearance on "Good Morning America." The "Project Runway" host looked nothing short of fierce in this frisky, feline-print sheath, which she drove home with a belt and ankle-streep peep-toes.

Olivia Wilde in Dolce & Gabbana at the "Cowboys & Aliens" World Premiere in San Diego. Miss Wilde oozed romance in this old-fashioned, lace-covered gown. 

Photos (left to right): Jon Kopaloff/FilmMagic; Jemal Countess/Getty Images; Charles Eshelman/FilmMagic; Ray Tamarra/Getty Images; Steve Granitz/WireImage