It's a girl!

Alyson Hannigan and husband Alexis Denisof welcomed their second child, daughter Keeva Jane, on May 23, her rep tells Us Weekly. The newborn joins big sister Satyana, 3.

The How I Met Your Mother star wed Denisof, 46, in 2003. The 38-year-old actress is the latest celeb to pop during the Hollywood baby boom, following Jennifer Garner, Hilary Duff, and most recently Jessica Simpson.

"They are doing well," her rep adds.

Congrats to the happy family!

What better way to celebrate Mother's Day then with a posh party in Brentwood?

The pregnant American Reunion star came to the party bearing a big box of fruit, but she looks very ripe herself!

Hannigan is due to give birth this summer, and shared via Twitter this week, "I could be doing the math wrong but I think I'm in my 5th trimester."

We think so too, Alyson!

Alyson Hannigan accidentally let it slip on The Rachel Ray Show that is expecting baby No. 2 in June, and it looks like she's already stocking up on toys -- with the help of her adorable 3-year-old, Satyana!

The adorable twosome hit up a posh toy store in Brentwood, where the little girl got to push her very own kid-sized shopping cart while looking chic in a rainbow colored dress, on Tuesday afternoon.

Hannigan recently told MSN on her daughter's excitement over having a sibling: "Oh, she's super, super excited! She is already a great big sister, and she's very excited about the baby. She rubs lotion on my belly and talks to the baby, and it's very sweet."

Now that all the craziness has died down from American Reunion, Alyson Hannigan can kick back and relax with her fam, while waiting for baby No. 2 to arrive!

The How I Met Your Mother star looked cute in a purple tie-died maxi dress and jean jacket, while accompanying her hot hubby Alexis Denisof and daughter Satyana on a play date in the park in Santa Monica, on Friday afternoon.

The darling 3-year-old was having a blast swinging from her daddy's arms, and making funny faces for the cameras, and Hannigan admits her little girl can't wait to be a big sis!

The American Pie star also exclaimed via Twitter this week, "Congrats to Jessica Simpson! Does this mean I now have the biggest baby bump in Hollywood?"

With American Reunion's success in theaters, pregnant actress Alyson Hannigan has lots to smile about.

Not only is Alyson's baby bump adorable, but so is daughter Satyana.

The red-headed starlet rocked a striped sweatshirt and flats ... while her tot held on tight to her pink sucker!

Just another day in beautiful Brentwood.

Jessica Simpson, is that you?

Alyson Hannigan stepped out to run some errands with a friend in Beverly Hills on Thursday, and we couldn't believe our eyes with the size of that belly! It feels like the How I Met Your Mother star just announced her pregnancy a couple months ago, but it appears she's ready to pop at any moment!

The rest of her American Reunion co-stars are busy making publicity appearances around the world, but the 38-year-old redhead isn't able to globetrott with them due to the imminent arrival of her little bundle of joy.

Hopefully she can deliver in time to make it to band camp!

Between planning her 3-year-old daughter Satyana's bday party -- while celebrating her own on March 24! -- making the promotional rounds for her newest film, American Reunion, and being many months preg, mommy-to-be Alyson Hannigan has had quite the busy month!

The How I Met Your Mother star played-up her growing baby bump in a blue flowered maxi dress, jean jacket and a bright red scarf, while strolling with hubby Alexis Denisof and her darling daughter in Santa Monica, on Sunday afternoon.

Hannigan's American Pie castmates are currently headed to Australia to continue promoting the film, but unfortunately her baby bump has left the actress permanently grounded!

Hard to believe we first met the cast of American Pie back in 1999! Now, the original cast is back for the new flick American Reunion.

Chris Klein, Shannon Elizabeth, Seann William Scott, Jason Biggs and a very pregnant Alyson Hannigan all hit the red carpet still looking sexy after all these years. Mena Suvari, Eddie Kaye Thomas and Tara Reid also made an appearance.

As you can imagine, the fans went wild as the stars arrived at the Grauman's Chinese Theatre in Hollywood.

Check out the below Twitpic of a tanned and gorgeous Tara Reid posing alongside the Jedward twins ... and an apple pie.

The movie hits theaters on April 6, and we can't wait!

Click thru to see the hilarious trailer.