The two walked the red carpet at SF & GQ Magazine's Stop Puppy Mills Humane Society benefit.
Throughout the night, Odom, 29, put his arms around her waist and kissed her on the lips.
Khloe, 25, wasn't wearing her engagement ring.
Though she skipped press, Odom spoke to reporters, but wouldn't offer any details.
Asked if he was excited about Sunday, he coyly told reporters, "I'm always excited when I'm with Khloe."
Where is her ring?
"What ring?" he replied. "Can't tell you. If she wants to tell you, she'll tell you.
Earlier in the day, Khloe confirmed the two were wedding.
"I'm thrilled to finally be able to tell you that the news is true..." she wrote on her website. "Lamar and I are getting married on Sunday!!! I couldn't be happier and I'm so excited that I can finally share the news with all of you."
She continued, "Your well wishes have meant the world to me and I am truly so blessed to have such amazing fans, family and friends during this incredible time in my life."
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