Jennifer Aniston has revealed her huge engagement ring.

The 43-year-old actress is set to tie the knot to Justin Theroux after he popped the question to her in August, but she hasn't showed off her band until now when the 'Friends' actress was spotted with her fiance in Sante Fe, New Mexico, on the weekend.

Jennifer even managed to keep her finger hidden away while filming 'We're the Millers' over the last two months, but the ring has been unveiled after a picture of the couple embracing in the US, with the band clearly visible, was posted online.

Justin proposed to Jennifer during his birthday dinner at the beginning of August and his spokesperson later confirmed the news that the 'Horrible Bosses' actress had given him an ''extraordinary'' birthday present by saying she would marry him.

He said: ''Justin Theroux had an amazing birthday on Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage.''