Andy Cohen welcomes baby boy: 'I'm speechless!'

Andy Cohen is officially a father!

The 50-year-old "Watch What Happens Live" host took to Instagram late Monday night to announce the birth of his first child, son Benjamin Allen Cohen, who was born via surrogate on Monday evening.

"WOW! This is my son, Benjamin Allen Cohen," he captioned a black-and-white photo of himself holding his baby. "He is 9 lbs 2 ounces!!" 20 inches!! Born at 6:35 pm, PT."

He went on to reveal that the name he chose for his first child has a special meaning.

"He is named after my grandfather Ben Allen," he went on. "I'm in love. And speechless. And eternally grateful to an incredible surrogate. And I'm a dad. Wow."

SEE ALSO: Real Housewives react to Andy Cohen's baby announcement

Cohen has been living in Los Angeles as he awaited the birth of his son, and he's been filming "WWHL" from a temporary studio there. He normally lives in New York City.

41 PHOTOS
Andy Cohen out and about
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Andy Cohen out and about
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured (l-r): Andy Cohen, Ariana Madix and Scheana Shay -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - FEBRUARY 12: Andy Cohen and Patricia Clarkson visit SiriusXM Studios on February 12, 2018 in New York City. (Photo by Santiago Felipe/Getty Images)
NEW YORK, NY - FEBRUARY 5: Andy Cohen attends the Todd Snyder February 2018 fashion show during New York Fashion Week: Mens' at Pier 59 Studios on February 5, 2018 in New York City. (Photo by Paul Bruinooge/Patrick McMullan via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Peter Kramer/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - JANUARY 23: Andy Cohen attends the 92nd Street Y Presents Dan Rather Discussing His New Book 'What Unites Us' at 92nd Street Y on January 23, 2018 in New York City. (Photo by Jamie McCarthy/Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- BELOW DECK REUNION -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - NOVEMBER 16: TV host Andy Cohen attends the screening of Sony Pictures Classics' 'Call Me By Your Name' hosted by Calvin Klein and The Cinema Society at Museum of Modern Art on November 16, 2017 in New York City. (Photo by Jim Spellman/WireImage)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - NOVEMBER 08: SiriusXM's Town Hall with Mark Wahlberg and Will Ferrell hosted by Andy Cohen (C) at SiriusXM Studios on November 8, 2017 in New York City. (Photo by Cindy Ord/Getty Images for SiriusXM)
NEW YORK, NY - MAY 15: Andy Cohen attends the 2017 NBCUniversal Upfront at Radio City Music Hall on May 15, 2017 in New York City. (Photo by Taylor Hill/FilmMagic)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MAY 08: SiriusXM host Andy Cohen and actress Diane Lane pose for photos during a taping of 'Andy Cohen Live' on SiriusXM's Radio Andy at the SiriusXM Studios on May 8, 2017 in New York City. (Photo by Ben Gabbe/Getty Images)
NEW YORK, NY - MAY 05: Andy Cohen and Naomi Campbell attend Sean Penn & Friends HAITI TAKES ROOT: A Benefit Dinner & Auction to Reforest & Rebuild Haiti to Support J/P Haitian Relief Organization at Sotheby's on May 5, 2017 in New York City. (Photo by Kevin Mazur/Getty Images for J/P Haitian Relief Organization )
NEW YORK, NY - MAY 05: TV personality Andy Cohen attends The Sean Penn & Friends Haiti Takes Root Benefit Dinner & Auction Supporting J/P Haitian Relief Organization at Sotheby's on May 5, 2017 in New York City. (Photo by Monica Schipper/WireImage)
NEW YORK, NY - MAY 05: (L-R) Andy Cohen, David Diehl, and Christy Turlington speak onstage during MTV's 2017 College Signing Day With Michelle Obama at The Public Theater on May 5, 2017 in New York City. (Photo by Mike Coppola/Getty Images for MTV)
TODAY -- Pictured: Hoda Kotb, Kathie Lee Gifford and Andy Cohen on Wednesday, May 3, 2017 -- (Photo by: Nathan Congleton/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MAY 01: Goldie Hawn, Andy Cohen and Amy Schumer during the SiriusXM Town Hall with Goldie Hawn and Amy Schumer on Andy Cohen� Exclusive SiriusXM channel Radio Andy at SiriusXM Studio on May 1, 2017 in New York City. (Photo by Kevin Mazur/Getty Images for SiriusXM)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured (l-r): Tamra Judge, Andy Cohen and Dorinda Medley -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - APRIL 26: Television personality Caitlyn Jenner (L) and host Andy Cohen speak during the SiriusXM 'Town Hall' with Caitlyn Jenner; 'Town Hall' to air on Andy Cohen's exclusive SiriusXM Channel Radio Andy at SiriusXM Studios on April 26, 2017 in New York City. (Photo by Dimitrios Kambouris/Getty Images for SiriusXM)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MARCH 06: (EXCLUSIVE COVERAGE) (L-R) SiriusXM host Andy Cohen poses with actor Samuel L. Jackson during a taping of SiriusXM's Radio Andy at the SiriusXM Studios on March 6, 2017 in New York City. (Photo by Astrid Stawiarz/Getty Images)
BOSTON, MA - MARCH 04: Bravo Media's Andy Cohen hosts The 8th Annual Lenny Zakim Fund Casino Night In Boston at Four Seasons Hotel on March 4, 2017 in Boston, Massachusetts. (Photo by Paul Marotta/Getty Images for The Lenny Zakim Fund )
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - FEBRUARY 27: Lisa Kudrow (R) and Andy Cohen pose together at SiriusXM Studios on February 27, 2017 in New York City. (Photo by Rob Kim/Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - FEBRUARY 15: Andy Cohen and Ricky Martin attend SiriusXM's 'Town Hall' With Ricky Martin (L); 'Town Hall' To Air On Andy Cohen's (R) Exclusive SiriusXM Channel Radio Andy on February 15, 2017 in New York City. (Photo by Anna Webber/Getty Images for SiriusXM)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured (l-r): Andy Cohen, Tracee Ellis Ross and Shaun White -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured (l-r): Andy Cohen, Lisa Rinna and Eileen Davidson -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK, NY - JANUARY 27: Tim Olyphant and Drew Barrymore interviewed for SiriusXM's Town Hall to air on Andy Cohen's Exclusive SiriusXM Channel Radio Andy on January 27, 2017 in New York City. (Photo by Cindy Ord/Getty Images for SiriusXM)
LATE NIGHT WITH SETH MEYERS -- (EXCLUSIVE COVERAGE) -- Episode 477 -- Pictured: (l-r) Host Seth Meyers talks with Andy Cohen backstage on January 24, 2017 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
LATE NIGHT WITH SETH MEYERS -- Episode 477 -- Pictured: Andy Cohen during an interview on January 24, 2017 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured: Andy Cohen -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
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The Bravo personality had revealed that he was expecting a child in a surprise announcement on his show last December, when a slew of original Real Housewives were guests.

"Tonight, I want you to be the first to know that after many years of careful deliberation, a fair amount of prayers, and the benefit of science, if all goes according to plan, in about six weeks' time I am going to become a father," Cohen said at the time. "Thanks to a wonderful surrogate who is carrying my future. Family means everything to me and having one of my own that I have wanted in my heart my entire life. And though it's taken me longer than most to get there, I can't wait for what I envision to be the most rewarding chapter yet."

Last month, all of the Real Housewives threw Cohen a lavish baby shower at The Palm in Los Angeles, with clips from the celebratory affair going viral on social media. A few days later, he celebrated his impending fatherhood with close pals Kelly Ripa, Sarah Jessica Parker, Anderson Cooper and more.

Mazel to Andy!

11 PHOTOS
Wild videos from Andy Cohen's baby shower
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Wild videos from Andy Cohen's baby shower
Housewives. On. Tables. Redefining the Baby Shower in 2019. You can hear it all on Radio Andy Friday! (Thanks for the video @mozzzalella)
'We don't do bunnies anymore.' 🐰🐰🐰⚰️⚰️⚰️ #andysbabyshower #rhobh #andycohen #bravotv #lisarinna
Rinna is taking the reins! She also calls Sonja Ramona and my night is complete. (Graphic language) #andysbabyshower #lisarinna #kylerichards #andycohen #bravotv
The afterparty montage. Drunk Lisa, Unaccountable Teddi, Unintelligible Dorinda and Face Squish Gina made appearances! #andysbabyshower #bravotv #rhony #rhonj #rhoc #rhobh #rhoa #rhop #rhod
Omg it's beautiful!!! #babycohen #andysbabyshower #bravotv #andycohen
@bravoandy’s baby shower!! 💙👶🏼 @teresagiudice @ramonasinger
Oh yes. Love me some Andy and celebrating Baby Cohen with all my sisters is even better. We love you @bravoandy
Thanks OG’s Kyle, Vicki, Nene, Ramona & Teresa for hosting a party like no other. And @brucebozzi, the Palm Beverly Hills is now an iconic stop on any Housewives Tour. It’s the Room Where It Happened. (📸: @charlessykes)
Caption this, please. (📸: @charlessykes)
I’m speechless. Every Housewife, featuring @JohnMayer. (📸: @charlessykes)
Showering the dad-to-be! We love you @bravoandy #rhonj #babyshower #beverlyhills @palmrestaurant #ShoweringAndywithMazels #andysbabyshower #astarisborn
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