Christian Serratos dolls up in a sweet pink dress as she arrives at the 2011 Thirst Project Gala held at The Beverly Hilton Hotel on Tuesday evening in Beverly Hills, Calif.

The 20-year-old actress was joined by her Twilight costars Justin Chon and Michael Welch.

Michael is heavily involved in the organization and has even started the $5 Club, where you can donate just that to provide future generations and those without a chance to have clean water for the rest of their lives. Check out his video below!

15+ pics inside…