Luke Bryan already has a gift picked out for Carrie Underwood's second kid! (Exclusive)

Luke Bryan couldn't be more excited for Carrie Underwood, after learning that she's pregnant with her second baby.

ET's Lauren Zima caught up with the American Idol judge backstage during Day 2 of the 2018 iHeartRadio Music Festival at the T-Mobile Arena in Las Vegas on Saturday, and was the first person to tell Bryan about the singer's exciting news -- which Underwood first announced back in early August.

"Oh that's news to me! That she's pregnant," Bryan said, after being asked about watching the country star perform at the festival. "I'm very, very happy for them!"

It's a bit surprising that Bryan didn't know, considering he said he's "become pretty good buddies" with Underwood's husband, Mike Fisher, as they're both "Nashville guys."

"He has his the guy that built his lake, and my fish guy, we're all kinds of linked," Bryan said. "Mike's building a pond, I built a pond, that's our big connection… because we have little boys, and little boys have to have somewhere to go fishing."

Fisher and Underwood are already parents to a 3-year-old son, Isaiah, while Bryan and his wife, Caroline Boyer, share two sons -- 10-year-old Thomas and 8-year-old Tatum.

As for a baby shower present, Bryan already has an idea for what to get them.

"Well I'm gonna send them some fishing rods," Bryan revealed, adding that he predicts the couple are going to have another boy. "That's so good, I'm so glad to hear that," he added, still marveling at the pregnancy news.

The country crooner also dished on the upcoming season of American Idol, explaining that he is "just looking forward to auditions."

"We've got season one behind us, so we know each other's chemistry now," Bryan said, referring to his fellow Idol judges Katy Perry and Lionel Richie, as well as host Ryan Seacrest. "We all know each other as judges and we're working hard to find the talent and be great judges."

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Luke Bryan through the years
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Luke Bryan through the years
LOS ANGELES, CA - NOVEMBER 23: Singer Luke Bryan poses in the press room at the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
NASHVILLE, TN - DECEMBER 15: Luke Bryan performs onstage at the 2014 American Country Countdown Awards at Music City Center on December 15, 2014 in Nashville, Tennessee. (Photo by Kevin Winter/Getty Images)
NASHVILLE, TN - DECEMBER 15: Recording artist Luke Bryan, winner of the Male Vocalist of the Year award, poses in the press room during the 2014 American Country Countdown Awards at Music City Center on December 15, 2014 in Nashville, Tennessee. (Photo by Terry Wyatt/WireImage)
LOS ANGELES, CA - NOVEMBER 23: Recording artists Luke Bryan (L) and Taylor Swift attend the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Christopher Polk/AMA2014/Getty Images for DCP)
NEW YORK, NY - AUGUST 08: Country singer Luke Bryan Performs On ABC's 'Good Morning America' at Rumsey Playfield, Central Park on August 8, 2014 in New York City. (Photo by Mike Pont/FilmMagic)
FOXBOROUGH, MA - AUGUST 10: Luke Bryan performs in concert at Gillette Stadium on Sunday, August 10, 2014. (Photo by Matthew J. Lee/The Boston Globe via Getty Images)
CLARKSTON, MI - JUNE 19: Luke Bryan performs in support of his 'That's My Kind of Night Tour' at DTE Energy Music Theater on June 19, 2014 in Clarkston, Michigan. (Photo by Scott Legato/Getty Images)
LOS ANGELES, CA - NOVEMBER 23: Singer/songwriter Luke Bryan (R) and Caroline Boyer attend the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Jeff Kravitz/AMA2014/FilmMagic)
NASHVILLE, TN - NOVEMBER 05: Luke Bryan speaks in the press room with his award for Entertainer of the Year during the 48th annual CMA awards at the Bridgestone Arena on November 5, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)
NASHVILLE, TN - NOVEMBER 05: Luke Bryan performs during the 48th annual CMA Awards at the Bridgestone Arena on November 5, 2014 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
NASHVILLE, TN - NOVEMBER 04: (L-R) Dustin Lynch and Luke Bryan attend the 62nd annual BMI Country awards on November 4, 2014 in Nashville, Tennessee. (Photo by Erika Goldring/FilmMagic)
CONCORD, CA - OCTOBER 17: Luke Bryan performs during the 'That's My Kind of Night' tour at the Concord Pavilion on October 17, 2014 in Concord, California. (Photo by C Flanigan/FilmMagic)
SAN ANTONIO, TX - SEPTEMBER 18: Luke Bryan performs in concert at the AT&T Center on September 18, 2014 in San Antonio, Texas. (Photo by Gary Miller/Getty Images)
NEW YORK, NY - SEPTEMBER 14: Luke Bryan performs at Barclays Center on September 14, 2014 in the Brooklyn borough of New York City. (Photo by John Lamparski/WireImage)
NEW YORK, NY - SEPTEMBER 14: Luke Bryan performs at Barclays Center on September 14, 2014 in the Brooklyn borough of New York City. (Photo by John Lamparski/WireImage)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0121 -- Pictured: Musical guest Luke Bryan performs on September 10, 2014 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - SEPTEMBER 09: Luke Bryan performs onstage at Fashion Rocks 2014 presented by Three Lions Entertainment at Barclays Center of Brooklyn on September 9, 2014 in New York City. (Photo by Kevin Mazur/Getty Images for Three Lions Entertainment)
LOS ANGELES, CA - NOVEMBER 23: Singer Luke Bryan poses in the press room at the 2014 American Music Awards at Nokia Theatre L.A. Live on November 23, 2014 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - SEPTEMBER 1: Luke Bryan and his wife Caroline Boyer Bryan attend Day 8 of the 2014 US Open at USTA Billie Jean King National Tennis Center on September 1, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Jean Catuffe/GC Images)
NEW YORK, NY - AUGUST 08: Amy Robach, Connie Britton, Luke Bryan filming the season finale of 'Nashville' after his apperance on ABC-Tv's 'Good Morning America' on August 8, 2014 in New York City. (Photo by Steve Sands/GC Images)
NASHVILLE, TN - JUNE 05: Luke Bryan attends a press conference at the 2014 CMA Festival on June 5, 2014 in Nashville, Tennessee. (Photo by Terry Wyatt/Getty Images)
LAS VEGAS, NV - APRIL 02: Caroline Boyer (L) and co-host Luke Bryan attend the 52nd Academy Of Country Music Awards at Toshiba Plaza on April 2, 2017 in Las Vegas, Nevada. (Photo by Kevin Mazur/ACMA2017/Getty Images for ACM)
LAS VEGAS, NV - APRIL 02: Co-host Luke Bryan performs onstage at the 52nd Academy Of Country Music Awards at T-Mobile Arena on April 2, 2017 in Las Vegas, Nevada. (Photo by Jeff Kravitz/ACMA2017/FilmMagic for ACM)
NASHVILLE, TN - JUNE 07: Jason Derulo and Luke Bryan perform onstage during the 2017 CMT Music Awards at the Music City Center on June 7, 2017 in Nashville, Tennessee. (Photo by J. Merritt/FilmMagic)
BROOKLYN, MI - JULY 23: Luke Bryan performs during day 3 of Faster Horses Festival at Michigan International Speedway on July 23, 2017 in Brooklyn, Michigan. (Photo by Scott Legato/Getty Images)
NASHVILLE, TN - OCTOBER 18: Luke Bryan and Jason Aldean attend the 2017 CMT Artists Of The Year on October 18, 2017 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images for CMT)
LOS ANGELES, CA - APRIL 29: Singer/Judge Luke Bryan arrives at ABC's 'American Idol' show on April 29, 2018 in Los Angeles, California. (Photo by Allen Berezovsky/Getty Images)
LOS ANGELES, CA - MAY 21: Singers/judges Luke Bryan, Katy Perry and Lionel Richie attend ABC's 'American Idol' - Finale on May 21, 2018 in Los Angeles, California. (Photo by David Livingston/Getty Images)
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