What could these girls be up to? Kylie Jenner took to Snapchat on Monday, Oct. 9, to let fans know that she and fellow pregnant sister Khloé Kardashian are currently filming something together. “Filming a little YouTube,” Ky — who rocked long, blonde hair like KoKo — said in a video clip. “With my twin!”

While we wait with bated breath to find out what it is they’re working on, we sure hope it’s a joint pregnancy announcement. Though both Keeping Up With the Kardashians beauties are pregnant and expecting their first children, neither Kylie, 20, nor Khloé, 33, have confirmed the exciting baby news themselves.

khloe kardashian kylie jenner - snapchat

(Photo Credit: Snapchat)

However, Kylizzle — who is expecting a bundle of joy with boyfriend Travis Scott — showed off her itty-bitty baby bump at the iHeartRadio Music Festival last month. And Khloé, who is starting a family with her basketball player beau, Tristan Thompson, debuted her growing belly while promoting her Good American denim line in LA on Saturday, Oct. 7.

It seems that both reality stars are looking forward to first-time motherhood. “Tristan and I definitely talk about starting a family,” Khloé said on the last season of KUWTK. “[Tristan] wants to have five or six kids with me and that’s lovely. We could start at one and we could grow from there. But now knowing I’m not on birth control is just like — it’s scary. It’s like a really big step.”

For her part, Kylie has always wanted to have kids sooner than later. “I want kids for sure. I feel like seeing you guys go through everything, it’s great knowledge,” the Kylie Cosmetics founder said during a February 2016 episode of Kocktails With Khloé. “I feel like I want kids before I’m 30.”