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Even though they’ve been engaged since last August, Jennifer Aniston and Justin Theroux still appear to be as in love as ever.

After celebrating the release of Mandy Ingber‘s new book, Yogalosophy: 28 Days To the Ultimate Mind-Body Makeover, the couple joined several friends for dinner on the back patio of the Soho House in West Hollywood.

Tucked away in a back corner, the couple “looked absolutely in love and almost giddy,” an onlooker tells PEOPLE.

“Justin grabbed Jen’s face at one point and planted a huge kiss on her lips, then did it again within seconds,” the source adds. “Then he pulled her toward him and gave her a sweet kiss on the cheek.”

And Aniston was loving every minute of her fiancé’s public display of affection.

“She had a huge smile on her face as he showered her with attention,” the source says.

– Melody Chiu