Jennifer Aniston's hairdresser has arrived at her home amid rumours she will marry Justin Theroux today (10.08.13).

The 'We're the Millers' actress and her fiance have also secured parking restrictions around the perimeters of their Bel Air mansion in Los Angeles between 4 p.m. and 11:30 pm, despite claims she is merely hosting a small celebration for Justin's 42nd birthday.

The actor's representative told E! News: ''It's a birthday. Not a wedding. Today is Justin's birthday.''

Jennifer's long-time hair stylist and close friend Chris McMillian was spotted arriving at her home shortly after noon.

The couple - who met on the set of 2011 movie 'Wanderlust' - are reportedly planning to tie the knot in a low-key ceremony and will then celebrate their marriage with a bigger party later in the year.

A source previously said: ''August 10th is Justin's birthday, and their nearest and dearest have been invited to a huge 'birthday party'. But everyone is convinced they're planning to exchange vows within the grounds of their new home and for it to be a huge surprise on the day.

''They have gone to extreme lengths to keep it quiet - openly lying to their friends to keep up the ruse. Apparently it's going to be a very low-key affair with the possibility of a bigger celebration later on in the year.''

It is believed the 44-year-old actress - who was previously married to Brad Pitt - and Justin told their mothers Nancy and Phyllis, about their plans over a family dinner in New York two weeks ago, and both women will be at the wedding, despite Jennifer's strained relationship with her mum.