Jennifer Aniston has reportedly fallen for Paul Rudd, her friend for more than a decade.
US' National Enquirer said the actress is in love with the married Hollywood hunk, whom she is set to work with in new comedy film Wanderlust.
"I think Jen has developed an unhealthy attachment to Paul," a source said.
"After having her heart broken so many times, Paul seems like a safe alternative for Jen. She has a huge crush on a completely unattainable man.
"Jen has opened her heart up to Paul, and she's allowing her feelings to veer from platonic to close to romantic.
"But there's no way Jen's feelings for Paul can lead to anything but more heartbreak.
"It's as if she's living out her own private romance fantasy so she doesn't have to face the reality of her real-world, dead-end love life.
"Paul doesn't know about Jen's crush on him. He's just trying to be a good friend to her, but she's mistaken his affections for something more."
Rudd, who starred alongside Anniston in The Object of My Affection has been married to film executive Julie Yaeger since 2003.