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Gerard Butler & 50 Cent Rule the ‘Den of Thieves’ Premiere

Gerard Butler and 50 Cent both drew crowds on the red carpet for different reasons at the premiere of their big action flick.

Butler showed up with on-again / off-again girlfriend Morgan Brown … and they smooched it up for the cameras.

50 chose to walk the carpet with his adorable five-year-old son, Sire.

The “Power” star and his kid weren’t the only father/son duo — O’Shea Jackson Jr. also attended with his pops, Ice Cube.