Hollywood's got a major case of Bieber baby fever!

Oscar-winning actress Mira Sorvino and husband Christopher Backus welcomed their fourth child, a baby girl named Lucia, on Thursday in LA. The new little one joins big siblings Mattea, 7, Johnny, 5, and Holden, 2.

Congrats on the stork's arrival!

In other news, The Voice host Carson Daly and his partner Siri Pinter are expecting their second child. The expectant mom announced the happy news on her blog, saying, "[I'm] 5 and a half months already! I am beyond thrilled and blessed. I have been eating a lot of cookies." The happy pair are already parents to their three-year-old son Jackson.

Happy times!

Romeo and Cruz are bending it like a Beckham! No doubt, their soccer star dad, David Beckham, is proud.

The youngest Beckham boys, wearing Galaxy shirts, showed off their quick reflexes while kicking around the soccer ball on a Los Angeles field. Although older brother Brooklyn and younger sister Harper were no where in sight, these two were having a blast.

We have a feeling these two boys will be soccer studs in the future!

Mariska Hargitay is now a mother once again!

The Law and Order actress, married to Peter Hermann, adopted baby boy Andrew Nicolas Hargitay Hermann ... just six months after adopting daughter Amaya Josephine, according to People.

Hargitay, 47, tells the mag:

“We never in a million years thought it would happen this quickly, but something inside of us knew that this was right, and we said, ‘Yes, yes, yes!’ We knew this was our guy. Everything about it felt right. It felt divinely right.”

The actress is also mom to 5-year-old son, August.

Ashlee, who?

Pete Wentz stepped out with his new girlfriend, model Meagan Camper, just days after his ex Ashlee Simpson made her first public appearance with her beau, Broadway Empire's Vincent Piazza.

The former Fall Out Boy bassist held hands with his mystery GF during a supermarket run before heading off to a Toluca Lake playground Thursday afternoon to spend some quality time with Bronx, Pete's 2 1/2-year-old son with Ashlee.

This is the first time Pete's been spotted with a love interest since his split from Ashlee earlier this year. Bronx looked like he was having a great time hanging in the sandbox, so he's clearly met her before!

See more pics of Pete with the new GF and the always adorable Bronx below.

Like mother, like happy daughter!

Jessica Alba and her precious 3-year-old Honor were all smiles as they strolled through Santa Monica Monday afternoon.

The 30-year-old was picking up her precocious little girl from school, and Honor kept giggling as she hammed it up for the cameras -- she even showed off her pink string toy, which she turned into a ring!

Can you say adorable?

Jennifer Garner had an eventful Sunday afternoon, toting her adorable daughters Violet and Seraphina to a birthday party in Beverly Hills!

Both girls looked really excited to attend the party -- they each held their own colorful pastel bags, and Violet happily took a gift for mom to bring to the birthday kid inside!

Jen, who's in her second trimester with baby number three, held on tight to her Violet, who we can't believe is growing up so fast!

Keith Richards' daughter, supermodel Theodora, was arrested Tuesday night in New York City for allegedly vandalizing a building in SoHo.

Richards was taken into custody around 10:45 p.m. after cops say the model was
using a "paint marker" to graffiti the letters "T♥A" onto the side of a Soho building, which reportedly houses St. Anthony's Convent.

After being taken into custody, Richards was searched and law enforcement found marijuana and a controlled substance (eight-and-a-half hydrocodone pain relieving pills) on her person.

Richards is currently in the custody of the NYPD awaiting arraignment, which will most likely take place this afternoon.

Update: Theodora Richards appeared at Manhattan Criminal Court on Wednesday for her arraignment, and she was released without bail. Richards did not enter a plea, and did not comment to reporters as she left the courtroom. She is due back in court April 21.

Check out a pic of Theodora's artwork, after the jump ...

These are some of our favorite pix of the stars' kids this year -- check out our massive gallery of celebritots!