Jessica Biel and Justin Timberlake are all loved up after premiere of his baseball film

PUBLISHED: 16:34 EST, 20 September 2012 | UPDATED: 16:34 EST, 20 September 2012

They've yet to sink their teeth into wedding planning since he proposed last December.

But it seems Justin Timberlake and Jessica Biel are reveling in their life as an engaged couple.

The actors looked smitten with one another as they left an after-party following the premiere of his new movie Trouble with the Curve on Wednesday night.

Scroll down for video

The happy couple: Justin Timberlake and Jessica Biel attended the premiere of his new movie Trouble With the Curve in Los Angeles on Wednesday night

Justin, 31, wrapped his arm around his bride-to-be as they strolled out of the party in Los Angeles.

Jessica looked elegant in a black and punk embroidered dress paired with satin pimps and a blue Fendi bag.

The 30-year-old beauty wore her hair down and seemed comforted by her fiance's hand around her waist.

The pair, who began dating in 2007, were joined at the event by Justin's mother, Lynn Harless.

Arm-in-arm: Justin kept his bride-to-be close on their way out, wrapping his arm around her waist

Arm-in-arm: Justin kept his bride-to-be close on their way out, ! wrapping his arm around her waist

Arm-in-arm: Justin kept his bride-to-be close on their way out, wrapping his arm around her waist

Family time: The couple was joined by Justin's mother, Lynn Harless, at an after-party for the event

Earlier in the day, the singer-turned-actor was seen on the red carpet, joining co-stars Clint Eastwood and Amy Adams to pose for photos.

Justin was dressed down in jeans, a cotton collared shirt and blazer for the occasion, adding a bit of personality with a pair of blue suede shoes.

Amy meanwhile looked stunning in slinky red gown while co-star Morena Baccarin was elegant in a plunging navy and white number with a sheer panel covering her cleavage.

Catching a snack: Trouble with the Curve star Clint Eastwood enjoyed some popcorn on his way into the movie theatre

Justin plays baseball scout Johnny in the Robert Lorenz film, about an ailing baseball scout in his twilight years takes his daughter along for one last recruiting trip.

And while the star's wedding date remains a closely guarded secret, both Justin and Jessica haven't been able to resist gushing about one another as of late.

The Total Recall actress recently admitted she is in no rush to walk down the aisle, because she so enjoys being engaged.

Enfianced: Justin proposed to Jessica last December after five years together

Leading ladies: Amy Adamns, left, and Morena Baccarin, right, were stunning on the green carpet at the film premiere earlier in the day

Co-stars: Amy and Justin happily posed for photos at the event

Leading men: Clint Eastwood joined Justin for another snap ahead of the screening

She told This Morning: 'It's very exciting - its just hard to find the time, honestly. But it's a good moment just to enjoy it and take it easy.'

When asked what style of wedding she wanted, she replied: '! I have n o idea... I am one of those people who is not very detail orientated.

'I'll probably give an idea and let it be created. I feel like most of my friends, bless them, always go through some sort of something - one day of bridezilla - so maybe it's just part of the experience, you just have to do it!'

On screen: Amy Adams and Justin Timberlake share the screen in Trouble with the Curve, about an ailing baseball scout's relationship with his daughter

Earlier this month Justin also boasted about his bride-to-be and spoke at length about their home life, revealing they both love to cook.

Speaking to Jay Leno, he said: 'Shes really good (in the kitchen). It works out she likes to cook, I like to bake, so dinner and dessert.'

Trouble with the Curve is set to hit cinemas on September 21.

Watch video here