FALLEN FRIENDS!

Courteney plays third wheel as Jen courts Reese for new bestie

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FRIENDS alum Jennifer Aniston has a new bosom buddy in Reese Witherspoon, her co-star on The Morning Show, but that blossoming bond has her longtime BFF Courteney Cox feeling left out, reveal sources.

"Jen and Reese are so tight these days, it's become way more than a working relationship," spills a Hollywood insider. "It's left Courteney complaining she's losing her bestie."

As National ENQUIRER readers know, things weren't always so rosy between Jennifer, 55, and Reese, 48.