"No way is Jen getting married at this weight," a source close to the star told Radar.
"She'll lose another ten pounds before she'll walk down the aisle."
Aniston, 45, and Theroux, 42, got engaged in August 2012 and fans have been wondering ever since when the wedding will take place.
But now there's a new stumbling block as the actress has vowed to lose weight first.
The Horrible Bosses actress is devoted to a healthy diet and exercise plan that includes yoga, running, and working out, but she also famously loves wine and has admitted, "I indulge when I want to....I don't starve myself in an extremist way."
Well, maybe for a big movie role — or a wedding?
"Which, sounds terrible, but is absolutely how Jen operates among her peer group."