Stewart, 26, dressed for comfort during the outing, donning a white T-shirt, rolled-up ripped jeans, loafers, a baseball cap and sunglasses while carrying a backpack, reported Ace Showbiz.
Meanwhile, Cargile, who is also Stewart's former assistant, wore a green polo shirt, gray trousers, black trainers and a red cap.
The couple began dating last year before they broke up in October. The Bella Swan of the "Twilight Saga" movie series then dated French singer Stephanie "Soko" Sokolinski in March this year, before calling it quits in May.