'The Hunger Games' actor likes to take his pop star girlfriend for a hearty meal when they get together, as he finds the way she eats her steak a turn on.
He told Who magazine: "There is this place in Nashville called Steak and Shake, which is pretty much the best food, ever. That is our secret, sexy place to go
"When I look over at her when she's biting into a steak sandwich and there is some steak sauce dripping down her chin, there is nothing sexier than that."
Liam admits he has had to cut down on the steaks and fatty foods himself recently for his part as Gale in the futuristic sci-fi film.
He said: "Everyone's pretty hungry, so I wanted to look a little hungry. My brother said to me before I started shooting something about me putting on weight.
"Basically his point was that it was called 'Hunger Games', not 'Eating Games'. That was a wake-up call. I was like, 'Are you calling me fat or something?'"