Jen Aniston's pals 'label Justin a commitment-phobe'

Jennifer Aniston's famous friends have reportedly "urged caution" over Justin Theroux.

The former Friends star has been engaged to fellow actor Justin, 43, since August 2012. But two years on, the couple seem no closer to walking down the aisle and it has reportedly led her showbiz pals to voice their concerns.

"Several of Jen's friends, including Chelsea Handler and Demi Moore, are thought to have urged caution over Justin's reluctance to carry out the wedding, pointing out his reputation as a huge commitment-phobe," a source told British magazine Grazia. "Even Justin's own friends have joked that his line 'we're not on anyone else's time frame,' should be 'we're not on any time frame'."

Justin recently admitted he felt a "hum of pressure" despite saying earlier this year that he and Jennifer had "hot feet" about getting hitched, as opposed to cold. People close to The Leftovers actor feel his behaviour echoes his attitude during his 14-year relationship with stylist Heidi Bivens, which ended in 2011.

"One moment Justin would be dropping hints to Heidi about 'when we're married', before getting really vague and ultimately dismissing it as just a piece of paper," the source continued. "Justin seems hesitant to even discuss the kind of ceremony he'd like [with Jen]. Their recent trip to Bora Bora was a typical example - it seems Jen wanted the beautiful setting to inspire them to talk about romantic wedding locations, but it seems Justin has become a pro at deflecting her hints."

Things have reportedly been made worse for Jennifer, 45, because a number of her close friends, such as Courteney Cox and George Clooney, have either got engaged or married before her.

"Most of Jen's friends are marrying or having children around her, while she feels as if she's treading water," the source added.