Molly Sims and husband Scott Stuber welcome baby girl!

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Molly Sims and husband Scott Stuber welcome baby girl!
WESTWOOD, CA - MAY 15: Actress Molly Sims (L) and husband producer Scott Stuber arrive at the Los Angeles Premiere 'A Million Ways To Die In The West' on May 15, 2014 at Regency Village Theatre in Westwood, California. (Photo by Barry King/FilmMagic)
Actress and model Molly Sims and SodaStream reveal 12 foot sugar glass installation to raise awareness for sugarless sparkling beverages in Union Square on Wednesday, Aug. 27, 2014, in New York. (Photo by Evan Agostini/Invision/AP)
BRIDGEHAMPTON, NY - JULY 19: Molly Sims (L) and Brooks Alan Stuber attend the CMEE 6th Annual Family Fair at Children's Museum of the East End on July 19, 2014 in Bridgehampton, New York. (Photo by Eugene Gologursky/Getty Images for CMEE)
LOS ANGELES, CA - APRIL 27: Actress Molly Sims and son Brooks Stuber attends the Huggies Snug & Dry and Baby2Baby Mother's Day Garden Party held on April 27, 2013 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for Baby2Baby)
Molly Sims, host of MTV's Fashionably Loud during MTV's Fashionably Loud presents the Sports Illustrated 2002 Swimsuit Issue - Backstage (airing Thursday, February 21 at 10:00 PM ET/PT on MTV) at Hammerstein Ballroom in New York City, New York, United States. (Photo by KMazur/WireImage)
Molly Sims during MTV's Fashionably Loud Presents the Sports Illustrated 2002 Swimsuit Issue - Show (airing Thursday, February 21 at 10:00 PM ET/PT on MTV) at Hammerstein Ballroom in New York, New York, United States. (Photo by KMazur/WireImage)
Model Molly Sims, host of MTV's 'Fashionably Loud,' backstage wearing a bikini made of chili peppers. (Photo by J. Vespa/WireImage)
Molly Sims and Hoobastank during MTV's Fashionably Loud Presents the Sports Illustrated 2002 Swimsuit Issue - Show (airing Thursday, February 21 at 10:00 PM ET/PT on MTV) at Hammerstein Ballroom in New York, New York, United States. (Photo by KMazur/WireImage)
LAS VEGAS -- 'When You Got to Go, You Got to Go' Episode 12 -- Pictured: Molly Sims as Delinda Deline -- Photo By: Justin Lubin/NBC/NBCU Photo Bank
BEVERLY HILLS, CA - JUNE 08: Actress Molly Sims attends StepUp Women's Network 9th annual Inspiration Awards at The Beverly Hilton Hotel on June 8, 2012 in Beverly Hills, California. (Photo by Jason LaVeris/FilmMagic)
Actress and model Molly Sims and SodaStream reveal 12 foot sugar glass installation to raise awareness for sugarless sparkling beverages in Union Square on Wednesday, Aug. 27, 2014, in New York. (Photo by Evan Agostini/Invision/AP)
LAS VEGAS -- 'Whatever Happened to Seymour Magoon?' Episode 4 -- Pictured: (l-r) Molly Sims as Delinda Deline, Nikki Cox as Mary Connell -- Photo By: Paul Drinkwater/NBC/NBCU Photo Bank
SAG HARBOR, NY - AUGUST 16: Molly Sims attends the 3rd Annual 'The Hamptons Paddle & Party For Pink'on August 16, 2014 in Sag Harbor, New York. (Photo by Steven A Henry/FilmMagic)
NEW YORK, NY - JUNE 10: Actress and Style Icon Molly Sims hosted a private garden rooftop event at 620 Loft & Garden in the heart of Rockefeller Center to celebrate the first tastes of summer in Wendy's new Strawberry Fields Chicken Salad. As part of Wendy's #NewSaladCollection style board contest, Sims, who has served as judge, showed guests how to create the perfect summertime outfit using the seasonal salad as inspiration and encouraged fashionistas to share their salad-inspired look on June 10, 2014 in New York City. (Photo by Larry Busacca/Getty Images for Wendy's)
387781 04: Model Molly Sims poses for photographers at the London launch of the Sports Illustrated swimsuit issue April 11, 2001 in London, England. Sims is featured on the cover of one of the European editions of the magazine. (Photo by UK Press/Newsmakers)
Model Molly Sims at the Sports Illustrated Swimsuit Issue launch event at The Hammerstein Ballroom in New York City. 02/20/2001. Photo: Evan Agostini / Getty Images
Actress Molly Sims and her son Brooks attend the 2013 Baby Buggy Bedtime Bash at Wollman Rink in Central Park on Wednesday, June 5, 2013 in New York. (Photo by Evan Agostini/Invision/AP)
Molly Sims arrives at the 3rd Annual Production of The 24 Hour Plays in Los Angeles After Party at The Shore Hotel on Saturday, June 22, 2013 in Santa Monica, Calif. (Photo by Richard Shotwell/Invision/AP)
Model Molly Sims arrives at the 2013 Vanity Fair Oscars Viewing and After Party on Sunday, Feb. 24 2013 at the Sunset Plaza Hotel in West Hollywood, Calif. (Photo by Jordan Strauss/Invision/AP)
Actress Molly Sims and her son Brooks attend the 2013 Baby Buggy Bedtime Bash at Wollman Rink in Central Park on Wednesday, June 5, 2013 in New York. (Photo by Evan Agostini/Invision/AP)
SANTA MONICA, CA- MAY 17: Actress Molly Sims (L) and son Brooks Alan Stuber arrive at the Ovarian Cancer Research Fund's Inaugural Super Saturday LA event at Barker Hangar on May 17, 2014 in Santa Monica, California.(Photo by Jeffrey Mayer/WireImage)
Model Molly Sims arrives at the 2013 Vanity Fair Oscars Viewing and After Party on Sunday, Feb. 24 2013 at the Sunset Plaza Hotel in West Hollywood, Calif. (Photo by Jordan Strauss/Invision/AP)
Molly Sims during 2004 Sports Illustrated Swimsuit Issue - Press Conference at Club Deep in New York City, New York, United States. (Photo by Jason Nevader/WireImage for Sports Illustrated)
Molly Sims attends the 6th Annual Women in Film Pre-Oscar cocktail party at Fig and Olive on Friday, Feb. 22, 2013 in Los Angeles. (Photo by Todd Williamson/Invision/AP)
NEW YORK, NY - FEBRUARY 18: Model Molly Sims attends the Sports Illustrated Swimsuit 50th Anniversary Party at Swimsuit Beach House on February 18, 2014 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK - FEBRUARY 18: Model Molly Sims attends the 2003 Sports Illustrated Swimsuit Issue press conference held at Gotham Hall on February 18, 2003 in New York City. (Photo by Evan Agostini/Getty Images)
NEW YORK, NY - JUNE 10: Actress and Style Icon Molly Sims hosted a private garden rooftop event at 620 Loft & Garden in the heart of Rockefeller Center to celebrate the first tastes of summer in Wendy's new Strawberry Fields Chicken Salad. As part of Wendy's #NewSaladCollection style board contest, Sims, who has served as judge, showed guests how to create the perfect summertime outfit using the seasonal salad as inspiration and encouraged fashionistas to share their salad-inspired look on June 10, 2014 in New York City. (Photo by Larry Busacca/Getty Images for Wendy's)
Molly Sims and Enrique Iglesias during MTV's Fashionably Loud Presents the Sports Illustrated 2002 Swimsuit Issue - Show (airing Thursday, February 21 at 10:00 PM ET/PT on MTV) at Hammerstein Ballroom in New York, New York, United States. (Photo by KMazur/WireImage)
Actress and model Molly Sims walks the red carpet during The Radio Music Awards at The Aladdin Theatre for the Performing Arts, Monday Oct. 25, 2004, in Las Vegas. (AP Photo/Eric Jamison)
Molly Sims, co-star of 'Las Vegas' during NBC All - Star Casino Night - 2003 TCA Press Tour - Reception in Hollywood, CA, United States. (Photo by L. Cohen/WireImage)
LAS VEGAS -- Season 5 -- Pictured: (l-r) Molly Sims as Delinda Deline, Josh Duhamel as Danny McCoy (Photo by Mitchell Haaseth/NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - MAY 10: Molly Sims attends the Los Angeles premiere of 'Battleship' at Nokia Theatre L.A. Live on May 10, 2012 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
BEVERLY HILLS, CA - MARCH 27: Actress Molly Sims arrives at Valentino 50th Anniversary And New Flagship Store Opening On Rodeo Drive at Valentino Boutique on March 27, 2012 in Beverly Hills, California. (Photo by Jon Kopaloff/FilmMagic)
LOS ANGELES, CA - MARCH 15: Actress Molly Sims attends the UNICEF 'Playlist With The A-List' celebrity karaoke benefit at El Rey Theatre on March 15, 2012 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - FEBRUARY 07: Molly Sims attends the 'Safe House' premiere at the SVA Theater on February 7, 2012 in New York City. (Photo by Rob Kim/FilmMagic)
LOS ANGELES, CA - JANUARY 14: Actress Molly Sims arrives at the Art of Elysium's 5th Annual Heaven Gala held at Union Station on January 14, 2012 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
Actress Molly Sims attends Super Saturday LA benefiting the Ovarian Cancer Research Fund at Barker Hangar on Saturday, May 17, 2014 in Santa Monica, Calif. (Photo by Dan Steinberg/Invision/AP Images)
Molly Sims attends the DVF Journey of a Dress 40th Anniversary Party at Wilshire May Company Building on Jan. 10, 2014 in Los Angeles.(Photo by Jordan Strauss/Invision/AP)
Molly Sims attends the Carolina Herrera collection on Monday, Sept. 9, 2013, during Mercedes-Benz Fashion Week in New York. (Photo by Amy Sussman/Invision/AP)
LOS ANGELES, CA - DECEMBER 14: Molly Sims and Brooks attend the Third Annual Baby2Baby Holiday Party presented by The Honest Company on December 14, 2013 in Los Angeles, California. (Photo by Stefanie Keenan/WireImage)
LOS ANGELES, CA - AUGUST 03: Molly Sims and Brooks Alan Stuber are seen on August 3, 2013 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
Molly Sims, left, and Scott Stuber arrive at the World Premiere of "A Million Ways To Die In The West" on Thursday, May 15, 2014, in Westwood, Calif. (Photo by Jordan Strauss/Invision/AP)
Molly Sims and husband Scott Stuber attend the premiere of "Safe House", in New York, Tuesday, Feb. 7, 2012. (AP Photo/Charles Sykes)
SANTA MONICA, CA - MAY 17: Actress/Model Molly Sims and producer Scott Stuber attend the Ovarian Cancer Research Fund's Inaugural Super Saturday LA hosted by Molly Sims and Rachel Zoe at Barker Hangar on May 17, 2014 in Santa Monica, California. (Photo by Alberto E. Rodriguez/Getty Images)
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Actress Molly Sims and her husband, film producer Scott Stuber, welcomed their second child on Thursday.

Sims announced the news on Instagram, posting an incredibly sweet photo of their baby girl Scarlet May.

VIDEO: They're Having a Baby! 6 Best Pregnancy Announcements of 2014

Sims captioned the photo, "We welcome Scarlett May Stuber into our family. Our hearts are bigger with you here."

The 41-year-old mother of two revealed that she was pregnant in September in a post on her personal website. In January, she wrote another post to share that she was having a daughter.

PHOTOS: You Named Your Kid What?! Unique Celebrity Baby Names

"We couldn't be more excited," Sims wrote in a blog post. "I can't wait to meet our baby girl and I just know that Brooks is going to be the very best big brother ever. Two kids under three ... here we GO!"

She also posted the news on Instagram with an adorable pic filled with pink balloons and the simple caption, "IT'S A GIRL!"

Sims and Stuber, who tied the knot in September 2011, welcomed their first child, son Brooks, in June 2012.

VIDEO: Hollywood Moms React to Super-Fit Pregnant Model Sarah Stage

Recently, Sims, Vanessa Lachey, Rachel Zoe and Kerry Washington spoke with ET, where the moms and mothers-to-be shared their thoughts on pregnant model Sarah Stage, who is barely showing despite being nearly nine months pregnant.

Hear what the actresses had to say in the video below.

Hollywood Moms React to Pregnant Fitness Model

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