Amanda Bynes Makes Surprise Appearance at Fashion Event in L.A.

Amanda Bynes Makes Surprise Appearance at Fashion Event in L.A.
Amanda Bynes

07/24/2015 AT 10:40 AM EDT

Amanda Bynes attended her first Hollywood party in a long time Thursday night, making a surprise appearance at the launch of fashion designer Michael Costello's pre-fall capsule collection in Los Angeles.

Bynes, 29, who was last spotted in public in early June following two years of well-documented troubles, was photographed in a white lace minidress and dark sunglasses.

The former child star, who has attended fashion school herself at L.A.'s Fashion Institute of Design & Merchandising, toured the event and also spent time with Costello – a season 8 contestant on Project Runway – in a back room, perusing the outfits and chatting with his team about design and sketching.

A friend who knows the Costello team reached out to let the designer know Bynes was a fan and wanted to see his new collection.

"[The friend] called and said, 'Can she please come to the event? She's, like, the biggest Michael Costello fan.' I think it's so cute when you hear that big celebrities are fans of yours," Costello tells PEOPLE.

The actress, whom her attorney said in June was in a better place after a turbulent few years of troublesome behavior, smiled for photographers as she left the Costello event.

"Michael was a doll to her, and she had a great time," a friend of Bynes tells PEOPLE. "Amanda was there as a student of design ... She was in a back room with Michael looking at dresses and talking to his staff about design and sketching."

Amanda Bynes Makes Surprise Appearance at Fashion Event in L.A.| Amanda Bynes

Amanda Bynes


Costello also spoke with PEOPLE about the peach-colored gown he made for Kim Kardashian that Caitlyn Jenner wore in a promo for E!'s I Am Cait.

"It's kind of cool," he said. "I had no idea she was going to wear the dress. A mutual friend of ours who is a stylist couldn't even tell us what was going on until the promos came out. My boyfriend showed me the promo and said, 'Don't freak out. Don't have a fit. But I have something really cool to show you.' I was like 'Oh my God, this is so cool.' "

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