• "New Girl" star Zooey Deschanel and her sister "Bones" star Emily Deschanel arrive at the Fox Summer TCA All-Star Party in West Hollywood, California August 1, 2013.

"New Girl" star Zooey Deschanel and her sister "Bones" star Emily Deschanel arrive at the Fox Summer TCA All-Star Party in West Hollywood, California August 1, 2013. (Photo : REUTERS/Jason Redmond)

"Bones" Season 10 last aired a new episode on Fox on Dec. 11. The show's avid viewers are getting impatient waiting for the show's return air date. Meanwhile, TV reports have confirmed that a leading character's pregnancy will be written into the series.

Spoiler alert: This update contains "Bones" Season 10 spoilers. Read on at your own risk if you have not watched the most recent episodes.

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Emily Deschanel's pregnancy will be reflected on her "Bones" character, Temperance Brennan, TV Line reported. This means Booth (David Boreanaz) and Brennan's daughter Christine is going to be a big sister.

"Brennan and Booth will, a least initially, attempt to keep the pregnancy a secret from their co-workers," TV Line wrote in the same report, which also carried a "Bones" Season 10 character scoop about Arastoo.

Arastoo (Pej Vahdat) is going to be "trapped in Iran as a political prisoner" in a future episode of "Bones" Season 10, showrunner Stephen Nathan told TV Line. This storyline is expected to affect Arastoo's girlfriend and boss, Camille Saroyan (Tamara Taylor).

"The only way [Arastoo] can leave [Iran] is to solve a particularly sensitive murder. And of course he can't do it without help," Nathan added.

In a separate report, Nathan told TV Guide Arastoo goes back to Iran "because his brother is dying." The show boss teased, this Arastoo story in "Bones" Season 10 "will come back in a very, very major way later on in the season."

In a press release about the shows in its network, Fox announced "Bones" Season 10 returns on Mar. 26 (Thursday) with a new episode. This air date is still a month away, so fans are expected to endure the suspense a little bit longer.