Did Kylie Jenner Accidentally Let It Slip That She’s Pregnant with Baby #2?

On Thursday, reality star Kylie Jenner was on hand to celebrate Khloé Kardashian's 35th birthday.

In a clip posted on Khloé's Instagram Story, a voice that sounds similar to Kylie's is heard declaring, “I'm pregnant,” as the camera panned on a birthday cake.

In another video on Khloé's Instagram Story, Kylie did not look at all pregnant. While showing off her flat tummy in a coral bikini, the 21-year-old shared a sweet birthday message for her older sister, saying, “You are such a bright light in this world. There will never be another you, you truly are so special… I look up to you so much… You brighten all of our lives.”

We'll have to wait and see if Kylie starts showing!

A few months ago, Kylie expressed wanting to have another baby with boyfriend Travis Scott, writing on Instagram, “Let's f**k around and have another baby!'”

In response to the post, her friend Heather Sanders wrote, “Happy birthday Travis..I love you guys.. Perfect lil family now give stormi a brother.

Jenner corrected Sanders, “sister !!!!”

In February, Kylie posted a pic PDA pic of herself with Travis, captioning it, “baby #2?”

Fans didn't know if she was just teasing, or maybe announcing she was pregnant, but Kylie replied to one fan who asked her directly if she were already pregnant, "no lol."

People previously reported that the couple hopes to add another baby to the mix "sooner rather than later."

Jenner is already thinking of baby names! In a Q&A with former best friend Jordyn Woods, she said, “I haven't found anything that I love, love. But I definitely want another girl, hopefully, and I want her to have a really feminine name. That's all I know.”

Kylie and Travis are already the parents of daughter Stormi, who was also at Khloé's birthday bash and even made an appearance on Kylie's Instagram Story. In the video, Stormi was held by famous aunt Kendall Jenner.

Travis didn't seem to be at the party, which was also attended by Scott Disick's girlfriend Sofia Richie, and Malika Haqq.

A few months ago, Kylie opened up about how motherhood has changed her outlook on life. She told Interview Germany, “I always knew I wanted to be a young mother. I remember people used to ask, 'Are you ready for this?' And I always knew I was ready but you don't know what that love and that feeling is like until after you have a child, but I feel like I was definitely made for this and she has changed my life for the better.”

She elaborated, “The way that I look at things is a lot more positive and I really feel like my life didn't start until I had her.”