She's finally settled down with the man of her dreams.

And 45-year-old Jennifer Aniston is now happier to relax her tough, muscular physique for a softer silhouette.

Jennifer, who's engaged to marry Justin Theroux, flaunted her new-found curves in an elegant Antonio Berardi sheath formal dresses online on Wednesday night, walking the red carpet at the Horrible Bosses 2 premiere.

The actress reprises her role as sex-obsessed Julia Harris in the follow-up film, naturally opting for a killer look for the movie opener in London's Leicester Square.

Paying homage to bad bosses all over the world once again, the second instalment sees the original threesome Dale, Kurt and Nick follow up their mission to kill their managers by starting their own business.

Dentist Julia, allows Jennifer to leave her girl-next-door image behind once again and adopt her inner sexual deviant for a second time.

The actress has been surrounded by Best Actress Oscars buzz for her role in Horrible Bosses and told The Sun on the red carpet: 'You cant help but listen to it. It's very humbling and flattering. It makes you jitter from the inside out.'

Jennifer paired pin point heels with a thigh high split to show off her slim pins and highlighted a new curvature to her middle in the skintight number.

Sweeping her poker straight locks over one shoulder, Jennifer drew attention to a fuller cleavage with a flash of red in her neckline.

She showed off her oversized engagement rock with a hand on one hip paying tribute to her absent 43-year-old beau.

Now happily coupled up, Jennifer opened up about post-40 life in a magazine interview this week, admitting that she was having the most fun yet.

She told Harper's Bazaar this week: 'I've had more fun post-40 than I can remember. From a work point of view, a physical point of view, a psychotherapeutic point of view.'

This side of 40, Jennifer has enjoyed roles in We're The Millers, Wanderlust and He's Just Not That Into You.

Jennifer, who stopped to sign fan pictures on the red carpet, had acted alongside Horrible Bosses star Jason Sudeikis in We're The Millers only two years ago.

Jason plays Kurt Buckman in the Horrible Bosses sequel, playing the character for a second time alongside Aniston.

He brought along his stunning fiancée Olivia Wilde, who almost upstaged leading lady Jennifer in a similar black celebrity dresses.

Olivia only gave birth to the couple's first child in April but she shone on the arm of her moviestar beau, looking sleek in the floor-sweeping, cut-out semi formal dresses.

Panel displays in the middle, her skin looked strong and handsome, as if her back to her pregnancy.

Jason, at the same time, wearing a three-piece suit, grid to ensure his outstanding co-stars as the main person Jason bateman and Charlie's day.

Four pieces, including aniston, photo cinema theatre in London on Wednesday.

Jason is the hair of his head but also look sharp metal gray suit, and Charlie appear rugged complete facial hair.

Jason and Jennifer, who have played a faux husband and wife in the past, had obvious chemistry on the red carpet, giggling in front of the cameras.

It was another celebrity attended event that attracted the likes of red carpet regular Amy Childs, Hatty Keane and Brianne Howey.

Amy matched her flame-coloured locks to a red lace backless formal dresses australia that balanced her curves with a peplum skirt.

It cut low in the front to reveal her cleavage as she walked the red carpet solo on Wednesday night.

Image:long formal dresses