Could Darth Vader be heading for the altar? Cue the Imperial March-Wedding March mash-up.
Although Bilson's rep wouldn't comment, a friend of the former star of "The O.C." claims she's "thrilled beyond belief."
Page Six first reported that Bilson was sporting a ring on a Los Angeles to New York flight and even told a fellow passenger that she was engaged.
Bilson and Christensen, both 27, met when they co-starred in last year's action flick "Jumper."
Bilson previously dated Adam Brody, her co-star on "The O.C."Copyright © 2014, The Baltimore Sun