They’ve been two peas-in-a-pod since they started dating last year, but is a third party interrupting Justin Theroux and Jennifer Aniston’s inseparable bond?

PICTURES: Jennifer Aniston Celebrates Hollywood Star With A Kiss

According to Star magazine, Aniston is heartbroken after finding out that her beau has been connecting with ex-girlfriend Heidi Bivens behind her back while she’s been out of town filming her new movie We’re The Millers.

And to top it off, the mag alleges that Theroux “was recently seen taking a mystery blonde girl out to dinner at ABC Kitchen in NYC.”

Is the Hollywood “it” couple really headed for splitsville? A rep for the Friends star says absolutely not, telling RumorFix, “Its all rubbish as usual. Everything is made up in that story.  Star magazine is never even close to getting the truth.”