Just a day after Caitlyn Jenner, formerly known as Bruce Jenner, appeared in a stunning Vanity Fair cover, a source revealed to New York Daily News that Kim Kardashian may be expecting twins. The source also told the news website that Kardashian is keeping the news under wraps so that Caitlyn can have her moment.

“Kim has told a handful of people that she had in vitro and that two eggs were fertilized. She is waiting to see if they both ‘stick’ before she makes any kind of announcement,” the source reportedly said, adding: “She has to wait and see if they are both OK. And she is waiting to get an OK from her doctor that both the fertilized eggs are healthy.”

The news website reported Tuesday that the only people who knew about the twins were her husband Kanye West, her mother Kris Jenner and her sisters. The reality TV star, who is pregnant for the second time after giving birth to her daughter North West, is also reportedly planning to be seen in a “family outing” with Caitlyn very soon.

“They’re planning a family outing that’s going to be ‘accidentally’ filmed by the paparazzi,” another source told New York Daily News, adding: “They’re talking about doing it in New York and not L.A. Kris is reluctant to take part in it.”

Kardashian has struggled to get pregnant and had two failed attempts at vitro fertilization, New York Daily News reported, citing the previous season of “Keeping Up With the Kardashians.”

There were also speculations that Kardashian was secretly planning to get a surrogate and use a prosthetic belly to fake her pregnancy. Kardashian played down the rumors in a series of tweets on Tuesday.