Will wedding bells be ringing soon for Rachel Bilson? A Page Six spy spotted Bilson on a Virgin America flight from LA to JFK Monday night with her mom and tells us the actress is engaged to longtime beau Hayden Christensen. “A man sitting in front of her on the plane saw a ring on her finger and asked if she was married,” said our snitch, who overheard Bilson reply, “I’m not married yet, just engaged. I know I look like I’m 15, but I’m actually 27.” Her rep didn’t return calls.

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