Britney went on a double date with boyfriend Jason Trawick and his parents Saturday night, according to People.com.
Britney and the new fam-to-be ate at the Grafton on Sunset Hotel's Olive Kitchen & Bar from 5:30 p.m. til 7, enjoying meatballs and margarita pizza. After dinner they saw a show at the Pantages Theatre.
"She seemed to fit in very well with his family," the source tells People.com. "She seemed very comfortable. She was very warm to them."
"Britney and Jason were really affectionate," the source says, "but at the same time very respectful."