Jennifer Aniston keeps a close eye on 'new man' Justin Theroux at MTV Movie Awards after party

He’s her rumoured new man after years of romantic disappointment - so you can hardly blame Jennifer Aniston for keeping a close eye on Justin Theroux.

The 42-year-old former Friends actress has apparently been dating the actor and screenwriter for a few weeks, but their appearance at the MTV Movie Awards after party was the first time they’ve been out officially together.

The pair were at the Los Angeles branch of Soho House after the ceremony, which was held up the road at Universal City.

Jennifer Aniston was seen keeping an eye on rumoured new boyfriend Justin Theroux at the MTV Movie Awards after party at the Los Angeles branch of Soho House last night

The night before, Jen had picked up the Decade of Hotness Award at the Spike TV Awards in LA - so she shouldn’t worry too much about Justin straying.

According to People magazine’s Lesley Messer, Justin is a ’little edgier’ than Jen’s previous dalliances - with is going some considering John Mayer is an ex.

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Lesley continued: ’Apparently, she’s really happy.’

However, last month, a representative for Jen insisted the two are just good friends.

Party people, MTV Movie Awards host Jason Sudeikis poses with Jennifer and a very pleased-with-himself looking Justin

According to ABC news, Jen threw a small get-together for her best friends including Chelsea Handler and Courteney Cox on May 27 to introduce them to Theroux, who co-wrote Tropic Thunder.

A source told People magazine: ’They all had a great time and enjoyed Justin’s company.’

The magazine says that Jen and Justin, 39, met on the set of movie Wanderlust last autumn.

Jen plays Linda in the movie, about and urban couple who try and embrace a more counter-cultural lifestyle, opposite Justin’s character Seth.

Fitness fanatic, Jennifer Aniston picked up the Decade Of Hotness award at Spike TV’s Guys Choice Awards on Saturday and showed off her honed body

It wouldn’t be the first time the beauty has fallen for her co-stars either - she dated Vince Vaughn after they appeared together in 2006’s The Break-up and was rumoured to have paired up with Gerard Butler after last year’s The Bounty Hunter.

But Jen has yet to find lasting happiness following her divorce from Brad Pitt in 2005 after five years of marriage, amid rumours he’d cheated on her with Angelina Jolie while filming Mr & Mrs Smith.

Wanderlust meanwhile also stars Ray Liotta, Paul Rudd and Alan Alda and is out on 25 November.

Before that however, Jen stars in Horrible Bosses where she plays a ’sexually aggressive’ dentist who harasses her male assistant.

A comedy, it hits UK cinema screens on 8 June.