Sean Penn and Charlize Theron

Sean Penn and Charlize Theron

Charlize Theron and Sean Penn enjoyed a date night with his daughter.

The couple, who recently returned from shooting their upcoming film, 'The Last Face,' in South Africa, "were so cute" together despite being joined by Dylan Penn at the launch of Nasty Gal Melrose store in Los Angeles on Thursday (20.11.14).

A source: "They were so cute. He watched her while she shopped."

The insider also told E! News that the duo - who have been dating for almost one year - were "holding hands" for most of the evening.

Another source told PEOPLE.com: "Sean arrived hand in hand with Charlize, he followed her around the store while she mingled, posed for photos with her friend [Nasty Gal founder] Sophia Amoruso, [and] shopped the racks. He was a trooper and showed to everyone in the room how supportive he is of her. They looked so cute and in love."

Other guests at the bash included Christina Milian, Azalea Banks and Zac Efron's new girlfriend Sami Miro.

It's no surprise Dylan, whose mother is Sean's ex-wife Robin Wright, joined them at the event, as she recently gushed about how much she admires Charlize, 39.

The 23-year-old model said: "Well, she's brilliant for one thing, and she's the only woman since my mom who can shut my dad up. The only woman! That is a f**king challenge so... She's a powerhouse."