Flying high! Brie Larson packs on the PDA as she kisses fiancé Alex Greenwald goodbye at the airport

They have been dating since 2013 and are clearly still in the honeymoon phase.

And Brie Larson and her fiancé Alex Greenwald were not shy about showing off their PDA at LAX airport on Thursday.

The 26-year-old actress shared a passionate kiss with the hunky musician while sending him off for a departing flight.

Smoochfest! Brie Larson, 26, and her fiancé Alex Greenwald, 36, were not shy about showing off their PDA at LAX airport on Thursday

Smoochfest! Brie Larson, 26, and her fiancé Alex Greenwald, 36, were not shy about showing off their PDA at LAX airport on Thursday

The Academy Award-winning actress shared a warm embrace and proudly displayed her affection while parting ways with a sweet smooch.

Brie - who became engaged to Alex, 36, in March - grasped the musician, actor and record producer's face while puckering up.

Alex, who is best known as the lead singer of the rock band Phantom Planet, proposed while the pair were on vacation in Tokyo. 

Passionate PDA! The Academy Award-winning actress grasped the musician, actor and record producer's face while puckering up

Passionate PDA! The Academy Award-winning actress grasped the musician, actor and record producer's face while puckering up

She showcased her slender stems in black cropped Under Armour workout leggings.

The Room starlet donned a charcoal grey tank with a logo by media production company Legendary Entertainment.

She left her dyed red tresses - which she coloured in May for her upcoming role in The Glass Castle - cascade in relaxed waves past her shoulders.

Slim pins: The Room starlet showcased her slender stems in black cropped Under Armour workout leggings

Slim pins: The Room starlet showcased her slender stems in black cropped Under Armour workout leggings

Caffeine fix: Brie picked up a few beverages from Starbucks for herself and her fiancé, who she became secretly engaged to in March

Caffeine fix: Brie picked up a few beverages from Starbucks for herself and her fiancé, who she became secretly engaged to in March

A pair of dark shades rested neatly on her nose and she stepped out in a pair of comfy Nike slip-ons.

Brie has a busy year ahead as it was also announced last month at Comic-Con that she will star in Captain Marvel as Carol Danvers, who gets special powers after an alien encounter. 

'Call me Captain Marvel,' the beauty captioned an Instagram selfie a picture in July wearing a Marvel Studios cap. 

'Call me Captain Marvel!': Brie has a busy year ahead as it was announced last month at Comic-Con that she will star in Captain Marvel as Carol Danvers

'Call me Captain Marvel!': Brie has a busy year ahead as it was announced last month at Comic-Con that she will star in Captain Marvel as Carol Danvers

She later added: 'Thanks for the love! I'm so excited to be part of the team.'

Captain Marvel will be the first film in the Marvel Cinematic Universe to center on a female character.

The film is scheduled for release in March of 2019.  

Crazy in love! Brie and Alex have been dating since 2013 and he proposed while the pair were on vacation in Tokyo; here they are pictured at the Governors Ball in February after she won an Oscar for Best Actress in Room

Crazy in love! Brie and Alex have been dating since 2013 and he proposed while the pair were on vacation in Tokyo; here they are pictured at the Governors Ball in February after she won an Oscar for Best Actress in Room

 

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