Celeb bump day: Paulina Gretzky, Jessica Biel, Kourtney K, Carrie Underwood

Pregnant Paulina Gretzky shares this photo as she cups her baby bump in a black workout top paired with sheer black leggings (more on those later). Gretzky, who is the daughter of hockey great Wayne Gretzky, is expecting her first child with her fiancé, professional golfer Dustin Johnson.

Now, back to the leggings, which I admit I'm a little obsessed with. Gretzky is wearing the Lululemon High Times Crop Tech Mesh Leggings ($88, Lululemon), however they are unfortunately out of stock.

Johnson and Gretzky are expecting their bundle of joy this spring. When reporters asked Johnson if he wanted his child to be a golfer or hockey player, he gushed that "either one would be great."

Gretzky made the baby announcement on Instagram, as she shared a photo of her baby bump and gushed, "We're having a baby!!" Engaged since last July, the couple has yet to reveal the gender of the baby.

Next up: A Justin Timber-baby is in the works. Jessica Biel is pregnant

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Although ultra-private couple Jessica Biel and Justin Timberlake has yet to make an official baby announcement, sources reveal that Biel is indeed pregnant.

"Jessica is at least three months pregnant," a source told Radar Online. "And she's due in April!"

That's right, she and Kate Middleton are both expecting spring babies.

The news comes on the heels of the actress being spotted around town sporting what appeared to be a baby bump. Although we aren't surprised that she hasn't posted a "baby bump picture" on her social media pages, she did share this photo on Instagram as she wears a backpack with her hair up in a bump and wearing mirrored aviator glasses.

We can't wait for Biel to start showing off her chic maternity style — and we aren't alone. InStyle Editor-in-Chief Ariel Foxman wrote on her Instagram page that she was "looking forward to the red carpet maternity style pix to come" and congratulated Biel on her "impending motherhood" — although she has since deleted that post.

Next up: Kourtney Kardashian's adorable Halloween costume

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Photo credit: Kourtney Kardashian via Instagram

Meow. Pregnant Kourtney Kardashian dressed her baby bump in a form-fitting black cat costume, complete with ears and whiskers as she went trick or treating with her son, 4-year-old Mason who is dressed as Darth Vader.

The 35-year-old reality star is expecting her third child, a baby girl, with her longtime boyfriend Scott Disick. She is due in a few weeks and is expected to give birth right around Thanksgiving.

Kardashian also shared this cute photo of her daughter, 2-year-old Penelope, and her niece, Kim Kardashian's 16-month-old daughter North West, dressed in identical skunk costumes.

Photo: Kourtney Kardashian via Instagram

The mom-to-be recently told Us Weekly that she feels good, but gets tired easier.

"Any little thing takes a toll on me" she admitted. "I went to Disneyland for 10 hours... I usually go for at least 12, but that took like, two days [to recover]."

Next up: Carrie Underwood shows baby bump in new music video

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Wearing a long peach dress and showing off her baby bump, pregnant Carrie Underwood shared this photo from her new music video for her new song, "Something in the Water."

The 31-year-old singer is expecting her first child this spring with her husband, hockey star Mike Fisher.

Many fans have noted the lack of a baby bump in the mom-to-be, however these new shots show that the singer is starting to show.

Underwood's upcoming hosting duty for the CMA Awards will keep her busy, however it sounds like she is also making sure to schedule in some down time — including on Halloween. "I'm going to be a pregnant lady curled up on the couch watching scary movies in her PJs this year for Halloween. #NailedIt #HappyHalloween," she tweeted.

Next up: Pregnant Vanessa Lachey wears a gorgeous maxi dress at her baby shower

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Vanessa Lachey celebrated the upcoming birth of her second child, a baby girl, with a baby shower. The mom-to-be shared this photo on Instagram, in which she stands in front of her pink cake while her husband Nick Lachey holds her baby bump.

Love her dress? She looks gorgeous in this long-sleeve maxi dress, which is the Rachel Pally Stormy Dress Print ($238).

The cute couple is already parents to 2-year-old Camden, and she shared a sweet picture of the family dressed up in costumes straight from Neverland.

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