Jennifer Aniston and Justin Theroux are yet to set a wedding date

Justin Theroux is in the doghouse with fiancée Jennifer Aniston - because he asked his ex Heidi Bivens to their wedding.

The Friends star was upset because the 41-year-old had previously persuaded her not to invite any of her own former flames. 

A source tells Now: 'He must've had a "brain fade" moment.

'Jennifer hit the roof when she saw that he'd put Heidi on the guest list.'

Jen, 43, has now put her foot down. 

'Justin argued that Heidi's been part of his family for many years,' adds the source.

'Jen snapped back saying she was going to invite her exes Brad Pitt, John Mayer and Vince Vaughn!

'That seemed to help resolve things because now they've agreed no exes are to be invited.'

Read more about Jennifer Aniston and Justin Theroux in Now magazine dated 1 October 2012 - out now!

11140%7C00001f3f4%7C2071_Wk40-cover.gif

SEE PICTURES Jennifer Aniston Style File

SEE PICTURES Celebrity hair: Jennifer Aniston's styles over the years

SEE PICTURES Jennifer Aniston goes topless for perfume ad