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The stunning couple, who made a stellar return to red carpet at the premiere of Theroux's new HBO series The Leftovers on Monday evening, attended the afterparty for the upcoming flick at Tao Downtown, where the two touted their love for each other yet again.
The source says that the duo acted like "they were at their own private party," adding that "they didn't socialize much with other people" and "stayed upstairs."
"Jen and Justin were very intimately talking for what seemed to be a long time," the eyewitness reveals. "They looked very happy together."