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Rachel Bilson and Hayden Christensen were snapped leaving a friends house in Los Angeles, and we still don't see an engagement ring on her hand, but the on again/off again couple have been on again for quite some time!

The two started dating in 2007, and after getting engaged in 2008, they called things off in early 2010, only to get back together later that year, but it seems like they've had at least one more breakup in there over the last two years, right?

Bilson recently told USA Today of their relationship, "It's not a secret. I just don't talk about it." I mean, it's not really any of our business, but at this point you have wonder if they'll EVER get married!