This week was all about looking like a lady. And the winners are...

Aimee Teegarden in Pamella Roland at the "Prom" premiere in Los Angeles. The starlet looked beautiful in this heavily-beaded chiffon gown, which was just sweet enough without looking too immature. 

Megan Fox in Juan Carlos Obando at Jaguar’s celebration to honor the 50th Anniversary of the E-Type. The usually revealing actress proved a class act in this pastel, tie-halter sheath, which she paired with ankle-strap peep-toes.

Zoe Saldana in Isabel Marant at the Coach Benefit for the Children’s Defense Fund. The frilly, flirty nature of this dress has "Zoe" written all over it. The feminine actress added some extra spunk to her look with ankle-strap shoes and a python clutch.

Gwyneth Paltrow in Rachel Roy at the signing of her new cookbook “My Father’s Daughter.” Gwyneth has been on a serious hot streak lately, and this curve-hugging, yellow satin sheath, paired with sexy gladiator heels, served up even more fuel to the fire.

Reese Witherspoon in Jason Wu at the “Water For Elephants” premiere in New York. Sweet meets sassy in this lace-covered cocktail dress, which Reese glammed up with jewels and sparkling sandals.

Photos (left to right): Michael Tran/FilmMagic; Andrew H. Walker/Getty Images; John Shearer/Getty Images; Jon Kopaloff/FilmMagic; Jason Kempin/Getty Images