EXCLUSIVE: Jennifer Garner stuns in red dress at 'Nine Lives' premiere, talks surprising Teen Choice win

Jennifer Garner is looking more flawless than ever.

The 44-year-old actress made a head-turning appearance in a sleeveless red dress and black strappy heels on Monday at the Los Angeles premiere of her new film,Nine Lives, looking gorgeous on the blue carpet.

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ET caught up with Garner at the premiere, when she talked about her latest movie, a comedy about a businessman, played by Kevin Spacey, who finds himself trapped inside the body of his family's cat. Garner said it was great to take on projects that her three children with ex Ben Affleck -- 10-year-old Violet, 7-year-old Seraphina, and 4-year-old Samuel -- can go see.

"They are not here tonight, but it is super fun to make movies that they can have fun watching, that you can watch together as a family," Garner tells ET's Cameron Mathison. "You can take anyone from zero to 99 [years old] and have a good time."

Garner also talked about her surprising Teen Choice Awards win on Sunday for "Choice Movie: Drama," thanks to her film Miracles from Heaven. The movie faced stiff competition from Creed, Straight Outta Compton, and The Martian.

"We were shocked, we were thrilled!" the actress says. "To think that that little movie, which has so much heart to it, has been embraced the way it has, it just... And to see little Kylie [Rogers] get to experience. Kylie Rogers -- what a beautiful actress."

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In June, a source told ET that Garner and Affleck are "making it work" one year after announcing they were separating.

"They still have not officially filed paperwork for a divorce," the source said, adding, they "don't know if that will ever happen."

Watch the video below for the latest on Garner and Affleck's relationship: