They made their adorable appearance at a screening and reception for the film Meru at RED Studios in Los Angeles.
Both Biel, 33, and Timberlake, 34, opted for casual looks at the event, with Biel sporting a pair of jeans, a blouse and heels. Timberlake donned a button-down shirt, blue pants and white tennis shoes.
The singer and actress are seen in photos snuggling close to each other, even when snapping pics with fellow attendees like Jimmy Chin, Conrad Anker – Chin and Anker both star in the film – and Andra Day.
The couple had the honor of introducing the film. A photo shows them on stage, with Timberlake making a silly face at a microphone-wielding Biel.
They enjoyed a performance by Day at the screening for the film, which is about three climbers attempting to reach the summit of India’s Mount Meru.
Timberlake and Biel, who welcomed their first child, Silas Randall, in April, are known for turning events into cute date nights.