The bombshell actress, 36, slipped her gym-honed physique into a sexy red satin corset dress that cinched in her already slim waist.
The skirt of Fox's dress flowed to the floor and trailed behind her as she made her way into the venue with MGK.
Megan's raven hair was swept over one shoulder in glamorous waves and she sported what appeared to be a neon pink brace on her right arm.
The rapper-turned-rocker, 32 - who proposed to the Transformers actress last January - cut a stylish figure in a fitted black suit layered over a bedazzled turtleneck top.
Jaw-dropping! Megan Fox looked like a modern Jessica Rabbit as she hung on fiance Machine Gun Kelly's arm at Clive Davis' annual pre-GRAMMY gala in Los Angeles on Saturday night