Jennifer Aniston 'will be more open with Theroux'

Jennifer Aniston has reportedly chosen to take a less cautious approach to concealing her relationship with rumoured boyfriend Justin Theroux.

The Horrible Bosses actress has remained tight-lipped about her romantic endeavors in recent years, but was spotted last weekend kissing Theroux at an MTV Movie Awards afterparty in Los Angeles.

Tropic Thunder writer Theroux's desire to live life openly is believed to have inspired Aniston to re-examine her approach to dating, a source told Us Weekly.

The insider added: "She doesn't want him to get frustrated with her usual covert way of doing things, so she's compromising and relaxing about the paparazzi."

The couple have so enjoyed being together in LA over the past week that Theroux delayed a planned trip to New York City in order to spend more time with Aniston, the source claimed.

Aniston has previously been linked to John Mayer and Vince Vaughn and was married to Brad Pitt for five years.

Last Saturday, Aniston accepted the 'Decade of Hotness' prize at the Spike TV Guys Choice Awards.

Horrible Bosses is released on July 8 in US cinemas and on July 22 in the UK.

> Jennifer Aniston introduces Theroux to friends?

Watch a trailer for Horrible Bosses below: