Garner, 43, hit the red carpet at the Oscars on Sunday night, with her manager/close friend Nicole King by her side.
The actress smiled for pictures and waved to fans in the crowd, as she stayed in good spirits. When a few people on the carpet stepped on the train of her dress, Garner graciously told them, "It's okay!"
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Garner stunned in an off-the-shoulder black Atelier Versace gown, keeping her hair pulled back for the occasion.
She is set to present during the 88th annual Academy Awards, alongside Benicio Del Toro.
During rehearsals, the two kept things light and humorous, posing for a few selfies as Garner planted a smooch on Del Toro's cheek.
The big night comes just a day after Garner spent Saturday afternoon with Ben Affleck at their son Sam's 4th birthday party, which was held at her Pacific Palisades home earlier in the day. The family were later spotted grabbing dinner at a restaurant in Santa Monica.
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The reunion comes shortly after Garner's illuminating and candid Vanity Fair interview – in which she called Affleck the "love of my life."
The 88th annual Awards, hosted by Chris Rock, are being presented live on ABC from the Dolby Theater in Hollywood, California.