Chloe, who is the daughter of Topshop tycoon Sir Phillip Green, looked bronzed and slender as she posed for pictures on the red carpet in Los Angeles alongside Marc.
The British reality star was wearing a floor-length black satin gown, designed by Alexander McQueen, which featured a plunging neckline and gold embroidery around the skirt.
With one hand around Marc's neck, Chloe held a gold clutch bag in the other and swept her long curled hair over her shoulder as she nestled into her man.
Shoe designer Chloe, 23, has been dating 45-year-old Marc since February last year.
Marc split from his model girlfriend Shannon De Lima a month before he got together with Chloe. He was previously married to Jennifer Lopez for eight years, but they divorced in April 2012 and remain good friends.
The couple were rumoured to have split last April, however Chloe and Marc hit back at the claims by sharing a cute Instagram picture of themselves kissing.
Last night, they looked seriously loved up at the Grammys, proving this relationship was definitely not just a flash in the pan!
More red carpet looks from the Grammys:
Copyright: WENN Adriana M. Barraza