Robbie Williams will marry his long term girlfriend tomorrow (07.08.10).

The singer ' who has been dating actress and comedienne Ayda Field since 2006 ' will tie the knot in an intimate ceremony on the stunning island of Santa Catalina, off the coast of California.

A source revealed: 'Robbie and Ayda have been deeply in love for a long time now. They spend almost every waking minute of every day together and are completely inseparable.'

Robbie, 36, and Ayda, 31, have planned a small wedding, keeping the guest list 'as small as possible'.

The source added: 'They have tried to keep the guest list for the wedding as small as possible, and have only revealed scant details of the ceremony to the lucky few who are invited.'

Friends and family including Robbie's parents Pete Conway and Jan Williams and best friend Jonathan Wilkes have all flown out to Los Angeles from the UK.

However, Robbie's Take That bandmates ' Gary Barlow, Mark Owen, Jason Orange and Howard Donald - are all on vacations and are not expected to attend.

Robbie has dated a string of famous women, including actress Anna Friel, former All Saints singer Nicole Appleton ' who is now married to his long-time pop rival Liam Gallagher - and model Rachel Hunter but he revealed last year Ayda was the perfect woman for him.

He said: ' call her my Swiss Army Knife, because that's the way I feel about her ' she can do anything. She was training to be a lawyer and dropped out to become a comedian.'