Zac Hanson welcomes baby daughter Mary Lucille Diana Hanson

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Zac Hanson Welcomes 4th Daughter Mary Lucille Diana -- See the Sweet Pic!

Congratulations are in order for Zac Hanson and his wife of 10 years, Kate, who celebrated the birth of their fourth child on Saturday (Aug. 6).

Hanson Strips Down 'MMMBop,' Meghan Trainor & Backstreet Boys Duet on 'Greatest Hits'

"We are overjoyed to share the arrival of Mary Lucille Diana Hanson," the 30-year-old Hanson drummer told People.

The 8 lbs., 4 oz. baby girl, who will go by Lucille, was born in Hanson's hometown of Tulsa, Oklahoma. She joins siblings Junia Rose Ruth, 5, George Abraham, 2, and John Ira Shepherd, 8, according to People.

"It is such an inspiration to meet her and to imagine all of the adventures we will take together as a family of six," the musician said.

See photos of Hanson through the years:

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UNITED STATES - JANUARY 01: Photo of HANSON; Taylor Hanson, Isaac Hanson & Zac Hanson (Photo by George De Sota (ID 5073478)/Redferns)
UNITED STATES - JANUARY 01: Photo of HANSON; Taylor Hanson, Isaac Hanson & Zac Hanson (Photo by George De Sota (ID 5073478)/Redferns)
American boy band Hanson at the Hyde Park Hotel, London, September 1997. Left to right: Taylor Hanson, Isaac Hanson and Zac Hanson. (Photo by David Tonge/Getty Images)
Zachary Hanson, Isaac Hanson and Taylor Hanson (Photo by Jeff Kravitz/FilmMagic)
Taylor Hanson, Isaac Hanson and Zac Hanson of Hanson (Photo by Jeff Kravitz/FilmMagic, Inc)
SANTA MONICA,CA - AUGUST 6: Musicians Taylor Hanson, Zac Hanson, and Isaac Hanson attend the Second Annual Teen Choice Awards on August 6, 2000 at The Barker Hangar at The Santa Monica Air Center in Santa Monica, California. (Photo by Ron Galella, Ltd/WireImage)
Musicians Taylor Hanson, Zac Hanson, and Isaac Hanson 'Give An Interview for the 14th Annual MTV Video Music Awards' on August 19, 1997 at Central Park in New York City, New York. (Photo by Ron Galella, Ltd./WireImage)
Taylor, Isaac and Zack Hanson with Richie Sambora at City of Hope's 'Spirit of Life' dinner gala honoring Edgar Bronfman, Jr., Exec. Vice Chairman of Vivendi Universal, at the Universal Studios backlot in Los Angeles, Ca. October 11, 2001. Photo by Kevin Winter/Getty Images.
BURBANK, CA - JULY 15: Hanson with band members Isaac, Zac and Taylor perform on 'The Tonight Show with Jay Leno' at the NBC Studios on July 15, 2003 in Burbank, California. (Photo by Kevin Winter/Getty Images)
Isaac Hanson and Taylor Hanson during Hanson in Concert at The China Club in New York City on August 13, 2003 at China Club in New York City, New York, United States. (Photo by J. Countess/WireImage)
Zac Hanson, Isaac Hanson and Taylor Hanson during 'Stuck On You' - New York Premiere - Inside Arrivals at Clearview Chelsea Cinema in New York City, New York, United States. (Photo by Dimitrios Kambouris/WireImage)
NEW YORK - APRIL 12: (l to r) Isaac, Taylor, and Zac of the rock band Hanson talk to students at PS 40 as part of the VH1 Save The Music Master Class April 12, 2004 in New York City. (Photo by Scott Gries/Getty Images)
Isaac Hanson, Taylor Hanson and Zac Hanson during Hollywood Film Festival - 10th Annual Hollywood Awards - Arrivals at The Beverly Hilton Hotel in Beverly Hills, California, United States. (Photo by SGranitz/WireImage)
TODAY -- Pictured: (l-r) Isaac Hanson and Zac Hanson perform on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW WITH JAY LENO -- Episode 3996 -- Pictured: (l-r) Taylor Hanson, Issac Hanson, Zac Hanson of musical guest Hanson on February 24, 2011 (Photo by Paul Drinkwater/NBC/NBCU Photo Bank via Getty Images)
NAPA, CA - APRIL 09: (L - R) Taylor Hanson, Zac Hanson, and Isaac Hanson of Hanson pose at Montecello Winery as part of Aloft Hotels Presents Live in the Vineyard on April 9, 2011 in Napa, California. (Photo by Tim Mosenfelder/Getty Images For Live In The Vineyard LLC)
LANDGRAAF, NETHERLANDS - JUNE 12: Hanson pose for a group portrait at Pinkpop, Landgraaf, Netherlands, 12th June 2011, L-R Zac Hanson, Taylor Hanson and Isaac Hanson. (Photo by Paul Bergen/Redferns)
NEW YORK - OCTOBER 22: (4th from L) Zac Hanson, Taylor Hanson, and Isaac Hanson of the band Hanson are surrounded by the Vocal People during the VH1 Save the Music Foundation Family Day at the The Anderson School on October 22, 2011 in New York City. (Photo by Mike Coppola/Getty Images)
UNIVERSAL CITY, CA - DECEMBER 17: (L-R) Recording artists Zac Hanson, Taylor Hanson and Isaac Hanson of Hanson attend The Salvation Army's 2nd annual 'Rock the Red Kettle' event at Universal CityWalk on December 17, 2011 in Universal City, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - NOVEMBER 01: (L-R) Taylor Hanson, Isaac Hanson and Zac Hanson of Hanson perform at The Fonda Theatre on November 1, 2015 in Los Angeles, California. (Photo by Tibrina Hobson/Getty Images)
NEW YORK, NY - OCTOBER 16: Isaac Hanson, Zac Hanson and Taylor Hanson of Hanson visit at SiriusXM Studios on October 16, 2015 in New York City. (Photo by Robin Marchant/Getty Images)
NEW YORK, NY - APRIL 12: (L-R) Taylor Hanson, Isaac Hanson and Zac Hanson of the band Hanson visit 'U&A' at Music Choice on April 12, 2013 in New York City. (Photo by Jamie McCarthy/Getty Images)
LAS VEGAS, NV - SEPTEMBER 21: Taylor Hanson (L) and Isaac Hanson of Hanson Perform at Fremont Country Club on September 21, 2013 in Las Vegas, Nevada. (Photo by Jason Davis/Getty Images)
LONDON, ENGLAND - JULY 04: (UK TABLOID NEWSPAPERS OUT) Zac Hanson, Taylor Hanson and Isaac Hanson of Hanson attend the European premiere of 'Pacific Rim' at The BFI IMAX on July 4, 2013 in London, England. (Photo by Dave Hogan/Getty Images)
LAS VEGAS, NV - SEPTEMBER 21: (L-R) Zac Hanson, Taylor Hanson and Isaac Hanson of Hanson pose in the iHeartRadio music festival photo room on September 21, 2013 in Las Vegas, Nevada. (Photo by Chelsea Lauren/WireImage)
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Hanson's 'MMMBop' Gets the Doo-Wop Treatment Thanks to Postmodern Jukebox

Zac Hanson's two older brothers, Isaac and Taylor, are also fathers. Issac, 35, has three young kids with his wife, Nicole. And Taylor, 33, has five children with his wife Natalie.

Beginning Oct. 7-8 at Chicago's House of Blues, the "MMMBop" sibling trio will be playing back-to-back concerts in 10 U.S. cities to launch their appropriately named new craft beer, Mmmhops Pale Ale. The mini-tour ends with a two-night stand at San Francisco's Fillmore on Nov. 3-4.

RELATED: Watch Hanson perform an acoustic version of "MMMBop":
Hanson Performs an Acoustic Version of MMMBop on Greatest Hits

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