London, Feb 19 : `The O. C.' star Rachel Bilson and beau Hayden Christensen may soon announce their engagement, as the actress was spotted with a huge rock on her wedding finger.

Rachel, who has been dating Hayden for a year after the duo met on the sets of `Jumper', was spotted with ring while she was in flight going to New York, reports PageSix.

"A man sitting in front of her on the plane saw a ring on her finger and asked if she was married," The Daily Express quoted a source, as saying.

New Delhi, Dec 1 : Former O. C. actress Rachel Bilson and beau Hayden Christensen are planning to take their relationship to the next level—they are moving in together, according to reports.

The couple started going around after meeting on the set of ''Jumper'' last year, reports China Daily.

And now, the love-dovey duo has been working on designing their dream house in Uxbridge, Canada.

"Hayden is so in love with Rachel that he is letting her be a part of the designing process, which should be completed after Christmas. They plan on moving in permanently next March, if not sooner,” said a source.