Kaley Cuoco Pregnant, Expecting 1st Baby With Tom Pelphrey: A Timeline Of Their Relationship

Kaley Cuoco and her boyfriend Tom Pelphrey are expecting their first child together.

The "Big Bang Theory" alum announced her pregnancy via Instagram Tuesday. Cuoco shared a series of sweet photos with Pelphrey, including pictures of a slice of cake with pink frosting to reveal they are expecting a baby girl.

Some snaps featured Pelphrey holding a white onesie with the words, "I love my daddy," and the "Ozark" actor and the "Flight Attendant" actress carrying mugs that say "papa bear" and "mama bear."

Cuoco also shared a photo of her baby bump as well as a heartwarming shot of her holding up a positive pregnancy test while the couple looks lovingly at one another.

"Baby girl Pelphrey coming 2023," Cuoco wrote in the caption. "Beyond blessed and over the moon... I [heart] you @tommypelphrey!!!"

Some fans were surprised by Cuoco's baby announcement. Here's the timeline of her romance with Pelphrey, according to Entertainment Tonight.

April 21 — First Meeting

Cuoco and Pelphrey met at the Season 4 premiere of the Netflix series "Ozark" in April, seven months after her split from her ex-husband, Karl Cook. The two stars share the same manager, and the "Meet Cute" actress was there as their manager's guest.

"I went inside, I was so excited, and we met there -- and it was love at first sight," Cuoco told Entertainment Tonight of meeting Pelphrey. "He's the cutest of all."

May 23 — Instagram Official

Pelphrey made his romance with Cuoco Instagram official by sharing two Polaroid photos of them. He accompanied it with a lengthy caption.

"But nothing can save you. Not your friends, not the best Fred Astaire musical you've ever seen- the grace of it, not your mother's beauty, not a line from a letter you find at the bottom of a drawer, not a magazine or the next day. Nothing can save you. And you stand in the moonlight and a sweetness comes off the top of the trees, and the fence around the yard seals you off from the dark and you can't breathe. It is all so familiar and possible," the message read.

It continued, "It is too simple that there is this much good in the world and you don't know how to have it. And it makes you wonder when it was you lost your place. Then you catch a breeze, so warm and ripe, it makes you hope that someone will come who also cannot save you, but who will think you are worth saving."

May 23 — Walk of Fame

Cuoco and Pelphrey made their first public appearance as a couple when they attended the Hollywood Walk of Fame ceremony for TV producer and creator Greg Berlanti. They were seen holding hands, laughing and smiling together during the ceremony.

May 26 — Best Friend's Approval

Zosia Mamet, Cuoco's "Flight Attendant" co-star and real-life best friend, is a fan of Pelphrey, and she gave the romance her blessing.

"It's really interesting, and she said this from the beginning, I knew when she knew. When you're best friends with someone, when you're truly best friends and you love them that deeply, you're so interconnected," Mamet told ET. "And when I met him, I was one of the last to meet him. I met him and I was like, 'I feel like I've known you forever.' And he loves her like nobody's business, and that's all that matters to me."

July 27 — Sweet Birthday Message

Cuoco paid tribute to her boyfriend via Instagram on his 40th birthday by sharing a snap of him and accompanying it with a sweet message.

"To the incredible man that saved me in all the ways... Happy birthday, baby! To know you is to truly adore you ... The world lit up the day you were born. I love you!!" she wrote.

Sept. 12 — Red Carpet Debut at Emmys

The pair attended the Emmy Awards together and made their red carpet debut as a couple.

Cuoco was nominated for outstanding lead actress in a comedy series for her role in "Flight Attendant," while Pelphrey was nominated for outstanding guest actor in a drama series for his role in "Ozark."

Cuoco stunned in a colorful pink gown, while Pelphrey looked dapper in his tailored tux. They were seen showing off subtle PDA during the ceremony.

Oct. 11 — Baby News

In addition to Cuoco, Pelphrey also announced via his Instagram that they are expecting their first baby together.

Pelphrey shared a series of photos of them, including a snap of them holding mugs and kissing. In the caption, he wrote, "And then it was even MORE BETTER. Love you more than ever @kaleycuoco."