The Keeping Up With the Kardashians star, who has not confirmed her pregnancy herself, was spotted walking in the city while wearing light blue high-waist, ripped skinny jeans tucked into thigh-high black boots, a black belt, a black top and a full-length black wool coat.
It marked a rare public appearance for Khloe, who has kept out of the spotlight more in recent weeks. In late September, multiple sources told E! News that the 33-year-old is expecting her first child with 26-year-old Cleveland Cavaliers player Tristan Thompson, her boyfriend of more than a year.
During their trip to San Francisco, the Kardashian sisters visited Alcatraz and also rode a cable car in the city. Later on Sunday, Kim returned to Los Angeles to take part in the star-studded One Voice: Somos Live! A Concert For Disaster Relief telethon.