Amber Heard and Elon Musk reportedly have a "casual" relationship

A source told UsMagazine.com: "They continue to see each other and hang out from time to time when they are in the same city. It is nothing new. He is too busy doing things like building a tunnel under L.A. and sending people into space to seriously pursue anyone.

"Call it what you want. But they hang out and casually see each other whenever time permits."

Other well known faces at the screening included actress Michelle Pfeiffer and Viacom's Bob Bakish, according to the New York Post's Page Six.

A source previously claimed the 'Magic Mike XXL' star was "smitten" with the 45-year-old entrepreneur and wanted to go public with their relationship after her divorce was finalised in January.

The insider said: "Amber is over the moon about her divorce but she is even happier about being able to go public with Elon.

"She was telling friends over Christmas how smitten she is with Elon. They are already planning a lot of adventures together and she's relieved she can move on with her life.It's an exciting new chapter for both of them."

Elon recently divorced actress Talulah Riley for a second time after the couple rekindled their romance in 2013 following a year's split.