Heading Across the Pond to promote his new movie, Gerard Butler attended the UK premiere of "Olympus Has Fallen" at The IMAX in London on Wednesday (April 3).

The "300" star looked delightfully scruffy, wearing a well-tailored gray suit, white dress shirt, and gray tie as he posed for photos on the red carpet.

Already released in the U.S., the action flick follows former Presidential guard Mike Banning, who finds himself trapped inside the White House in the wake of a terrorist attack. Using his inside knowledge, Banning works with national security to rescue the President from his kidnappers.

Costarring with Gerard Butler are Aaron Eckhart, Dylan McDermott @DylanMcDermott , Morgan Freeman, Angela Bassett @ImAngelaBassett , and Melissa Leo @MelissaLeo .