Jennifer Aniston joined by Justin Theroux on London work trip

Jennifer Aniston has been photographed holding hands with Justin Theroux as the pair left a London club.

Aniston was snapped clasping hold of Theroux's hand as they exited the after-party of her new movie Horrible Bosses on Wednesday night.

The former Friends actress, who plays one of the titular 'horrible bosses', had earlier attended a photocall and screening of the black comedy at London's Southbank alongside co-stars including Jason Bateman and Kevin Spacey.

Aniston and Theroux were reported to have begun dating earlier this year, and Theroux was seen in the front row at Aniston's recent hand and footprint ceremony at Grauman's Chinese Theatre.

Theroux, who recently appeared in Your Highness, previously accompanied Aniston to a taping of Inside The Actor's Studio.

Aniston has remained tight-lipped on their relationship while promoting Horrible Bosses, although she did tell Good Morning America that she feels "very happy and lucky" in her personal life.

Horrible Bosses is currently playing in the US and opens in the UK tomorrow.

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Watch the red band trailer for Horrible Bosses below: