'The Big Bang Theory' Season 9 Spoilers: Celebrations Around Sheldon's Birthday; Excitement for Bernadette's Pregnancy

CBS' hit sitcom "The Big Bang Theory" season 9 returns this week with an exciting brand-new episode that is slated to see the gang finally celebrating one of their friend's birthday. Meanwhile, series star expresses excitement for the development of her character's pregnancy storyline.

According to the synopsis posted over at The Futon Critic for the episode titled "The Celebration Experimentation," Leonard (Johnny Galecki), Penny (Kaley Cuoco), Wolowitz (Simon Helberg), Koothrappali (Kunal Nayyar), Amy (Mayim Bialik), and Bernadette (Melissa Rauch) will throw a surprise birthday celebration for their friend, Sheldon (Jim Parsons).

The promo video from the network teases some big moments in the 200^{th episode of the show. As announced, the "Party of The Year" will see a host of guest stars including Adam West who appears as himself.}

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Moreover, Amy appears to be so happy with how things turn out for both her and Sheldon. Speculations indicate that on his big day, Sheldon might bring out the ring he previously bought for Amy.

In related news, Rauch recently spoke with The Toronto Sun to talk about the show's renewal for a 10^{th season. The actress shared how excited she is to finally have a baby on TV. For those who missed it, Bernadette announced to everyone that she's pregnant with Howard's child.}

"I'm very excited to have a TV baby with my TV family, and I'm interested as to how much we're going to see of the baby," she told the media outlet. Like the avid followers of the show, Rauch is looking forward to how the writers will develop their storyline.

"I think what's really great is the writers have always done this fantastic job when any big changes on the show happen, they've always kept the essence of what the show is and it hasn't changed that DNA as a show and it's beautiful how they have done that," she went on to say.

Helberg chimed in to say that like Rauch, he can't wait to experience "the anxiety and the joy" that the baby will bring.

"The Big Bang Theory" season 9 episode 17 premieres this Thursday, Feb. 25 at 8 p.m.