Enjoying a night out to raise awareness for a good cause, celebrities attended Global Green USA’s 10th Annual Pre-Oscar Party on Wednesday (February 20) in Hollywood.

Arriving as part of the hosting committee were Orlando Bloom and Miranda Kerr, who looked lovely in a festive navy, yellow, and orange dress with a peek-a-boo cutout just above the waist.

Other A-Listers who showed up at the Avalon to support the organization's green initiatives included Emmy Rossum in a pale pink gown, and Sophia Bush in an elegant white pant suit.

Also in attendance for the cocktail reception and musical performances were Helen Hunt and her boyfriend, Matthew Carnahan.

According to their website, Global Green USA fosters a global value shift toward a sustainable and secure future.