The Australian actress, who stars as Tilly in the adventure comedy movie's third instalment, had Crystal's arm resting on top of her hair as they posed on the red carpet, reported E! online.
Crystal, who plays Dexter, has appeared in all three of the movies, and has previous credits in Cameron Crowe's 'We Bought a Zoo' (2011), 'The Hangover Part II' (2011) and episodes of NBC's hit comedy 'Community'.
The Shawn Levy-directed film sees Ben Stiller's security guard Larry take a trip across the Atlantic to the British Museum when the cursed tablet that brings exhibits to life starts to lose its power.
Other guests at the screening included Gervais, Stiller, Wilson and Steve Coogan.