Samantha Ronson has hit it off with a new friend, Erin Foster, daughter of legendary songwriter David Foster. Sources tell us the two are “really happy” and Ronson’s pals are glad for her following her rocky friendship with Lindsay Lohan. One source said, “They are really happy together, and have told both of their families. Erin is a wonderful person.” Reps for Ronson and Foster didn’t get back to us.