Twice as nice! AnnaLynne McCord shows off her pretty sister Rachel as both wear lace masks for masquerade ball

AnnaLynne McCord sure is a siren.

And so is her sister, Rachel, who the leggy blonde showed off on Saturday night.

The siblings slipped on lace masks to enjoy the Beyond The Veil charity masquerade ball in Los Angeles.

The 29-year-old stole the show in an intricately designed feather mask that covered half her face.

She paired her gorgeous accessory with a ravishing emerald green silk dress that came just down to her knees, boasted a thigh-high slit to show off her slender pins.

The actress finished off her look with strappy black stilettos and a simple bracelet, keeping her jewelry simple. 

The former 91210 star was there to raise awareness and money for the organization Together1Heart.org, which she joined to bring awareness to the issues of women and child sex slavery around the world.

Rachel put on a very daring display in a plunging ensemble.

The blogger teased her perky cleavage in an extreme cut-out blouse which was tucked into a nude mini-skirt.

Despite boasting a successful film and TV career, AnnaLynne's main focus has been on her work as a human rights activist.

In fact, the star has previously spoken about taking on her role in CW's 90210 because it would help her with her charity work.

'The Producers from 90210 kept calling to offer me the job and it wasn’t until a friend of mine called me, that I realized that if I took the job it would allow me the platform and opportunity to really do something important outside of acting,' she told the Beverly Hills Lifestyle Magazine back in January. 

AnnaLynne has spoken out against sexual assault on a number of occasions.

In 2014, the actress wrote a tell-all piece in Cosmopolitan magazine about being raped and abused when she was 18 years old. 

'Someone makes one decision one night, and it changes the rest of your life. You don't forget,' the actress told People at a recent charity fundraiser.   

The multi-talented star has just finished filming a leading role in the upcoming movie 68 Kill, in which she stars as a vixen trying to rip off her sugar daddy boyfriend.