Jennifer Aniston is reportedly dating actor Justin Theroux.

The former 'Friends' star - who was previously married to Brad Pitt and has dated Vince Vaughn and John Mayer - enjoyed a romantic dinner date with the 'Your Highness' star at the Sunset Towers Tower Bar in West Hollywood last night (18.05.11) and the pair are said to have been getting to know each other "for a while".

A source told X17online: "Jen and Justin have recently started dating. They've known each other for a while, but they're more than friends now. They're cautious - they're both taking it slowly."

The couple arrived at the restaurant separately, enjoying a three-hour dinner, but left via an underground car park, ducking down in the back of a chauffeur driven car which took them both back to Jennifer's Beverly Hills mansion.

The 42-year-old actress - who recently had to deal with the death of her beloved dog Norman - was recently told by her Greek-born father John she should start looking for a man with similar heritage to himself.

Asked if he wanted Jennifer to be with a Greek man, John - whose real name is Yannis Anastassakis - said: "Yes, I would be glad about that. But he'd have to be a good Greek man."

Discussing what qualities that would entail, he added: "Honesty."