Cohen -- who plays Admiral General Aladeen, a deposed North African dictator who comes to America, in the upcoming comedy -- walked the red carpet with two statuesque models before stopping to talk with Seacrest.
"I'm wearing John Galliano, but the socks are from K-Mart," Cohen quipped; he said he was holding an urn of "Kim Jong-Il's ashes." He then spilled the urn on a shocked Seacrest, before being whisked away by security.
As Seacrest told Antonio Banderas and Melanie Griffith after the Cohen interview, the urn was likely filled with powdered pancake mix.
Watch footage of Cohen's prank above.