Contrary to the popular belief that Conrad's (Gibson) wife/girlfriend in EX3 was played by the Israeli Actress Sarai Givaty (Camilla), Natalie Burn did actually play Conrad's wife Kristina!
She's the actress that published a few pictures a couple of weeks ago with the EX3 cast that I posted on EXBlog.
Natalia Guslistaya (Natalie Burn) is an actress, choreographer, soloist in many classical and modern ballet performances and stunt player. She danced in the Bolshoi Theater, La Scala, the Royal National Theater and other legendary venues. She is a member of the renowned Actors Studio in New York and West Hollywood, California. She is a film and theater actress, also known as dance and music clip producer.
This is not the first time she plays alongside an Expendable. In 2011 she played Elianna with Lundgren in "In the Name of the King: Two Worlds".
Here's the link to her website if you'd like to know more about her.