Mark-Paul Gosselaar and wife welcome baby girl Lachlyn

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Mark-Paul Gosselaar and wife welcome baby girl Lachlyn
SANTA MONICA, CA - MAY 16: Actor Mark-Paul Gosselaar (L) and wife Catriona McGinn attend Heal the Bay's 'Bring Back the Beach' annual awards gala at The Jonathan Club on May 16, 2013 in Santa Monica, California. (Photo by David Livingston/Getty Images)
SANTA MONICA, CA - APRIL 9: Mark-Paul Gosselaar and Catriona McGinn arrive at The American Red Cross Annual Red Tie Affair at the Fairmont Miramar Hotel on April 9, 2011 in Santa Monica, California. (Photo by Gregg DeGuire/FilmMagic)
Actor Mark-Paul Gosselaar (R) and Catriona McGinn attend Disney on Ice presents 'Let's Celebrate!' at L.A. LIVE on December 15, 2010 in Los Angeles, California.
HOLLYWOOD, CA - JUNE 18: Actor Mark-Paul Gosselaar (R) and Catriona McGinn (C) attend Film Independent's 2012 Los Angeles Film Festival premiere of Disney Pixar's 'Brave' at the Dolby Theatre on June 18, 2012 in Hollywood, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - DECEMBER 12: Actor Mark-Paul Gosselaar (R), wife Catriona McGinn and children attend 'Rockin' Ever After' presented by Disney On Ice at Staples Center on December 12, 2013 in Los Angeles, California. (Photo by David Livingston/Getty Images)
WEST HOLLYWOOD, CA - APRIL 05: Actor Mark-Paul Gosselaar, Michael Charles Gosselaar, wife Catriona McGinn and Ava Lorenn Gosselaar attend the Safe Kids Day at The Lot on April 5, 2014 in West Hollywood, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - OCTOBER 05: Actor Mark-Paul Gosselaar attends the 2014 Best In Drag Show at the Orpheum Theatre on October 5, 2014 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured: Mark-Paul Gosselaar -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - AUGUST 06: (EXCLUSIVE COVERAGE) (L-R) Actors Breckin Meyer and Mark-Paul Gosselaar visit the SiriusXM Studios on August 6, 2014 in New York City. (Photo by Astrid Stawiarz/Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured (l-r): Mark-Paul Gosselaar and Mel B. -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
BURBANK, CA - JUNE 09: Actors Mark-Paul Gosselaar and Tim Allen attend the Screen Actor's Guild Foundation's 5th Annual 'Actors Fore Actors' Los Angeles Golf Classic at Lakeside Golf Club on June 9, 2014 in Burbank, California. (Photo by Alberto E. Rodriguez/Getty Images for SAG Foundation)
BEVERLY HILLS, CA - DECEMBER 06: Mark-Paul Gosselaar arrives at the March Of Dimes' Celebration Of Babies Hollywood Luncheon at Beverly Hills Hotel on December 6, 2013 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0204 -- Pictured: (l-r) Jimmy Fallon and Mark-Paul Gosselaar during the 'Saved by the Bell' skit on February 4, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0204 -- Pictured: (l-r) Jimmy Fallon, Mark-Paul Gosselaar, Tiffani-Amber Thiessen, Elizabeth Berkley and Mario Lopez during the 'Saved by the Bell' skit on February 4, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0204 -- Pictured: (l-r) Jimmy Fallon, Mark-Paul Gosselaar, Tiffani-Amber Thiessen, Elizabeth Berkley and Mario Lopez during the 'Saved by the Bell' skit on February 4, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0204 -- Pictured: (l-r) Jimmy Fallon, Mark-Paul Gosselaar, Tiffani-Amber Thiessen, Elizabeth Berkley and Mario Lopez during the 'Saved by the Bell' skit on February 4, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0204 -- Pictured: (l-r) Jimmy Fallon, Mark-Paul Gosselaar, Tiffani-Amber Thiessen, Elizabeth Berkley and Mario Lopez during the 'Saved by the Bell' skit on February 4, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0204 -- Pictured: (l-r) Jimmy Fallon, Mark-Paul Gosselaar, Elizabeth Berkley and Mario Lopez during the 'Saved by the Bell' skit on February 4, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
The cast of 'Saved by the Bell' reunites in a sketch on 'The Tonight Show with Jimmy Fallon,' and the crowd goes wild! Sean Dowling (@seandowlingtv) has the details.
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Mark-Paul Gosselaar and his wife, Catriona McGinn, welcomed their new baby daughter on Tuesday!

On Wednesday, the former Saved by the Bell star took to Twitter to announce the big news, tweeting, "So in love with our new baby girl, Lachlyn! Born last night 2/17 Mum and baby are healthy and happy. 2 boys, 2 girls, too perfect!"

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

Aside from sharing his baby's name, Gosselaar also Instagrammed one of the cutest baby pics ever, captioning the adorable photo of his sleeping baby, "She's a 'mouth-breather' like her Daddy. My sweet little angel."

The couple announced they were expecting in December.

This is Gosselaar's second child with McGinn after they welcomed their son, Dekker Edward, in October 2013. Gosselaar has two other children, 10-year-old son Michael and 8-year-old daughter Ava, with his ex-wife, Lisa Ann Russell.

PHOTOS: You Named Your Kid What?! Crazy Celeb Baby Names

Congrats to the happy family!

Check out the video below for a look at some of the greatest celebrity baby announcements from 2014.

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