Malinda Williams at MAC Cosmetics And V Magazine Celebrate MAC's 'Hello Kitty Collection' at Cedar Lake - Inside, New York City, USA - 05.02.09

The 28-year-old Jarhead star and his actress lover were recently spotted ring shopping at New York's Fred Leighton jewellery store, and his latest co-star insists it's obvious the couple will be man and wife soon.

She tells Life & Style magazine, "I wouldn't be surprised if they get married soon. Reese was on the set a lot. She and Jake are clearly in love.

"They're like two regular, down-home people. They seem very comfortable around each other... It's like they've been together for a really long time - like an old married couple."

Source: WENN