Great expectations as Jennifer finally finds a best friend in Justin

Romance blossomed for the pair on the set of Wanderlust last year.

Jen plays one half of an urban couple who move down south from New York to experience an alternative existence in a commune.

Justin plays one of the residents, a one-with-nature guy who coaxes dairy from animals and plays guitar for the ladies.

Though they don't end up together in the film, the trailer shows their chemistry during some hilarious scenes

Of course, Jen has a history of falling for her co-stars.

She was linked to Vince Vaughn – with whom she appeared in The Break Up

And there were rumours of a real life romance with Gerard Butler who lensed The Bounty Hunter with her

But Justin is different.

Rather than having conventional leading man looks, he is darker and more brooding.

He has cool Indie roots, being part of the Theroux clan – as the nephew of the travel writer and novelist Paul Theroux, and the cousin of quirky TV presenter Louis, famous for his compelling documentaries.

He cut his teeth as an actor with small parts in shows like Sex and the City and Six Feet Under, before moving onto movies.

Among his first big film roles was American Psycho. The thriller was followed by Mulholland Drive, which he promoted at Cannes with director David Lynch and co-stars Naomi Watts (left) and Laura Harring.

Part of the draw is surely his sense of humour.

Justin co-wrote acclaimed comedy hit Tropic Thunder - a gig which led Robert Downey Jr to recommend him for the job as screenwriter for Iron Man 2

Before stepping out with Jennifer, Justin was in a long-term relationship with stylist Heidi Bivens, who he started dating in 2005.

In fact, when rumours started circulating that Jen and Justin were an item, Heidi's mother said it must be a "misunderstanding"

After months of insisting they were "just good friends", Jennifer and Justin were spotted on their first high profile date, at an MTV awards party.

According to one partygoer, the pair left holding hands

Before long, pictures of an overjoyed Jennifer out and about with her new man were commonplace.

The star had never looked happier. Not even the furore over comments Brad Pitt made about their marriage could rain on her parade.

Brad originally told Parade magazine he began to "feel pathetic" during their time together adding "I wasn't living an interesting life.

"I think my marriage had something to do with it," he said. "Trying to pretend the marriage was something that it wasn't."

But the star spoke out to explain his comments, after he felt they were taken out of context.

"It grieves me the way this was interpreted," he has said. "Jen is an incredibly giving, loving and hilarious woman who remains my friend"

"It is an important relationship I value greatly".

Things seemed to be getting more serious when Jen's new man was on hand to see her receive a star on the Hollywood Walk of Fame.

There were still no PDAs, but the couple's shy looks at each other, and Justin's proud smile seemed to suggest they were more than just friends

Then there was Justin's remarkable makeover.

Commentators thought he'd spruced himself up for his new love

When in November last year, Jen was pictured looking fuller around the middle, the rumour mill went into overdrive.

But the actress told HELLO! she had just put on a little weight after she stopping smoking. And she had no plans to tie the knot, either.

"I am not planning to get married any time soon.

"This ring that I'm wearing is not an engagement ring. I've been married once and I don't know if I'll get married again, but I can tell you that as of this very moment, as of today, I have no plans to get married"

 

She did, however, acknowledge being "in a good place right now". " I’m excited about life and it’s a pretty wonderful time"

Although, she didn't mention Justin by name, you only have to look at pictures of the pair together to see the reason behind the Friends actress' sunny demeanour.

It could be that with Justin at her side, Jen is finally getting her Hollywood ending