"I walked in the door and our dog had a bowtie on," Bryant told Meyers.
"Basically the second I shut the door a man, who I discovered was Conner, frantically came around the corner and was just like, 'Will you marry me?' No box, no 'I love you.'"
"[He was] just a man in full terror, standing very far from a dog in a bow tie, just holding a loose ring going, 'Will you marry me?' I was like, 'What?' I truly couldn't comprehend what was happening. I just kept saying, 'Is this a joke?'" she confessed.
"Then I said, 'Of course I'll marry you. I love you.'"
Bryant and O'Malley, an actor and a former writer for "Late Night," got engaged in October after eight years of dating.
The actress said O'Malley later explained the reasoning behind his frenzied proposal.
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"He was like, 'Well, you always said that you wanted it to happen in our house if it ever happened,'" she recalled.
"He was like, 'But I also knew you probably wanted to be wearing a bra and have makeup on, so I knew I had to do it after you just got home from work -- otherwise it would never be another moment.'"
"He did the right thing! It's about a 40-second window before I get in the door and I rip off my mask and become a woman on the couch," the star confirmed with a laugh.
Bryant sparked engagement rumors in January after she was spotted wearing a diamond sparkler during an interview with Glamour.
The actress and O'Malley looked the happy couple during a visit to Canada last week.
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