Jennifer and Justin's Cinematheque date

Jennifer Aniston and her fiance Justin Theroux look like the perfect couple as they pose on the red carpet for the American Cinematheque Gala in Beverly Hills, California.

The lovebirds attended the event to support fellow actor Ben Stiller.

Aniston looked sexy on the red carpet and said her style rule is to always be comfortable in an earlier report..

Whether she is going casual for daytime or dressing up for events, the former 'Friends' star likes to feel comfortable in what she wears after some unfortunate fashion incidents in the past.

She said:

"Don't wear jeans that are so tight they make your tummy hurt. Don't wear heels that are so high you feel like you're going to fall over. "Sexy is about being at ease in your body. There have been a few times when I've had to say to my girlfriends 'Could you please come and undo me so I can pee?' I mean literally it's like you have to have an engineering degree just to get into a flipping dress."

When Jennifer finds an item of clothing that she loves, she will wear it over and over again.

She told People magazine: "I really love my Tom Ford bag and my Stuart Weitzman wedges. I've worn them into the ground."

Jen also recently revealed her secret beauty tip is lots of sleep and water.

She said: "My best tip is sleep. Honestly. Hydration drink a lot of water - and get your sleep."

© Bang Showbiz