Khloe Kardashian's baby bump is already noticeable.

On Saturday, the reality star stepped out in San Francisco wearing a black shirt, oversized black blazer and blue high-waist jeans that showed off her baby bump, Us Weekly reported. According to the publication, Tristan Thompson's girlfriend had been filming some scenes for E!'s "Keeping Up with the Kardashians" with sisters Kim Kardashian and Kourtney Kardashian.

Khloe's pregnancy made headlines in September. Two of her sisters are also expecting. Kim has already confirmed that she and husband Kanye West are expecting her third baby via surrogate. Meanwhile, Kylie Jenner, 20, remains mum about her reported pregnancy, neither denying nor confirming the rumors. However, her followers noticed that her chest is noticeably bigger in her latest Instagran post, speculating that it was a clear indication that she is indeed pregnant.

Meanwhile, Khloe has been open about her desire to have children with Thompson. In fact, the couple had always wanted a big family, and the NBA star has already told his girlfriend that he is ready to be a dad. "He wants to have kids now," Kardashian said of Thompson. "He said, 'I want to have kids with you, [and] if you get pregnant, you could make maternity jeans for [your clothing line] Good American."

"He wants to have like, five or six kids with me, and that's lovely. We could start at one and then grow from there. But now, knowing I'm not on birth control, it's really scary. It's like a really big step," the "Kocktails with Khloe" star added. "I am really, really excited about my future with me and Tristan. We're doing so well, and I'm looking forward to see where all that goes."

Earlier this month, Khloe and Thompson were spotted out and about in Cleveland. Khloe wore a black sweatshirt, leggings and knee-high boots. However, during their outing, she was visibly hiding her midsection by covering it with her bag.

Although Khloe and Thompson are having a baby, an insider previously revealed that the pair is not in a rush to get married before the delivery. They might tie the knot, but not anytime soon. "They have talked about having kids together," the source said. "They have long-term plans they are talking about together."

What can you say about Khloe's tiny baby bump? Drop a comment below.