Kim Kardashian Secretly Afraid Pregnant-With-Twins Beyonce Has Stolen Her Stardom

Kim Kardashian was reportedly floored when she learned frenemy Beyonce was pregnant with twins.

And the Keeping Up with the Kardashians sexpot is jealous because she thinks the singer's pregnancy has stolen her own celebrity thunder! according to a new report.

"Kim thinks she's a bigger star than Beyonce," an insider told the Daily Star. "The fact that Beyonce is going to have more kids than Kim once her twins are born absolutely drives her nuts."

Mom-of-two Kardashian fears Beyonce, who has been basking in the attention since announcing her pregnancy, has leapfrogged over her as the "biggest star in the world," said the Daily Star sources.

As RadarOnline.com has previously reported, there is a longstanding rivalry between the two women and Beyonce's pregnancy has only made things worse.

"Kim was shocked at the Beyonce news and she was totally checking it out and seeing how many people like the post," an insider told RadarOnline.com about Beyonce's pregnant Tweet. "….she was actually hurt and worried."

Kardashian, 36, who raises daughter North, 3, and son Saint, 1, with husband Kanye West, 39, has a troubled marriage, as RadarOnline.com has reported.

RadarOnline.com has also reported that the reality TV beauty was stunned when she learned that iconic singer Beyonce kept the news she is expecting twins a secret from her.

The two women, who are believed to have an on-again, off-again friendship, sometimes see each other as fame rivals, according to the report.

Beyonce, 35, who already has a daughter, Blue Ivy, 5, with husband Jay Z, 47, and is now expecting two more with the rapper, reportedly doesn't trust Kardashian with personal secrets—so she didn't tell her the baby news ahead of time.

According to the newspaper, the baby feud has started a new "cold war" between the Kardashian/West and Carter couples.

"Kim isn't part of Beyonce's inner circle and never will be," a source has told RadarOnline.com.