"Jen and Justin love each other. They are fully committed," says a source. "They had hoped to be married by now, but work commitments this year meant their plans went astray. They have had some counseling. They both regret not spending more time together this year, and they're determined that next year will be different."
To that end, Aniston, 44, and Theroux, 42, reportedly plan to uphold their holiday tradition of sipping margaritas and soaking up the sun together in Mexico, same as they did last year. After that, he's said to be due back in New York to film the HBO series "The Leftovers."
As for their long-awaited nuptials, "Jen and Justin are looking at it like it's a party for their friends," explains the insider. "They've downgraded the scale of their wedding. Justin is adamant it will happen in 2014 but that it will be more 'spontaneous and organic' than they’d previously wanted."
Keep clicking for more photos of Jen and Justin's nearly three-year romance …