Rachel Bilson and Hayden Christensen: Engaged!

Rachel Bilson and Hayden Christensen, her longtime boyfriend, got engaged quietly over the holidays, according to the New York Post‘s Page Six!

According to a friend of the former star of The OC, the gorgeous couple, who have dated for years now and co-starred in Jumper, got engaged in December.

“They’re so excited,” says the pal, adding that no wedding date has been set. “They’re a great couple. Rachel seems thrilled beyond belief.”

When contacted, Bilson’s rep declined comment, saying “I don’t comment on my clients’ personal lives.” Christensen’s rep couldn’t be reached for comment.

The Page Six snitch says a man sitting in front of Rachel Bilson on a Virgin America flight from LA to JFK Monday night with her mom saw a ring on her finger.

“He asked if she was married,” says the Post source, who heard Bilson reply, “I’m not married, just engaged… I know I look like I’m 15, but I’m actually 27.”

Congratulations go out to Rachel and the tall dude we are rather jealous of. Click to enlarge more pictures of the newly-engaged pair (and a few of just her):

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