Hilary Duff had this 'sad' conversation with son Luca about baby No. 2

When Hilary Duff told her son, Luca, 6, that he was going to be a big brother, he wasn't immediately thrilled about the exciting news -- in fact, he's actually "a little nervous" about the prospect of having a little sister.

"The first conversation was pretty sad," Duff told AOL's Gibson Johns during a recent sit-down at the Imagine If, With Jif launch. "He was like, 'Why?' Because it's been just us for six years!"

Duff welcomed Luca with ex Mike Comrie back in 2012, and she announced in June that she's expecting her second child (and first with boyfriend Matthew Koma), a daughter. Since she broke down for Luca what this means for them as a family, he's begun to come around on the idea of welcoming another person into the fold.

"I was like, 'Dude, you have no idea. This is going to be a really good thing for our family. Mom has so much room in my heart for you and a sister and you're going to have so much fun watching her grow and teaching her things,'" she recalled to us. "I also told him that babies are funny! I was like, 'And I'm going to chase you around with her dirty diapers sometimes.' And he was like, 'Nooo!' If I keep it lighthearted, then he has fun with it and I do think he's excited. He's touching my belly now and saying 'goodbye' to her when he goes to school."

What's made the transition easier for Luca, too, is the fact that Duff's older sister, Haylie, recently welcomed a second child of her own -- a girl named Lulu. 

"That has really helped," Hilary explained of Luca getting another cousin. "He's like, 'Well, I'm going to get one of those, too!'"

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Hilary Duff out and about
NEW YORK, NY - AUGUST 27: Actress and mom Hilary Duff announces the 'Imagine If, With Jif' contest kick off with Jif� Peanut Butter on August 27, 2018 in New York City. (Photo by Dia Dipasupil/Getty Images for Jif)
LOS ANGELES, CA - JULY 26: Hilary Duff is seen on July 26, 2018 in Los Angeles, California. (Photo by BG002/Bauer-Griffin/GC Images)
NEW YORK, NY - JUNE 05: Hilary Duff seen on the streets of Manhattan on June 05, 2018 in New York, NY. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
BROOKLYN, NY - JUNE 04: Hilary Duff attends 'Younger' season 5 premiere party at Cecconi's Dumbo on June 4, 2018 in Brooklyn, New York. (Photo by John Lamparski/WireImage)
NEW YORK, NY - MAY 19: Actress Hilary Duff attends the Vulture Festival Presented By AT&T - Milk Studios, Day 1 at Milk Studios on May 19, 2018 in New York City. (Photo by Dia Dipasupil/Getty Images for Vulture Festival)
NEW YORK, NY - MARCH 27: Hilary Duff is seen filming 'Younger' in Union Square on March 27, 2018 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - DECEMBER 19: Actress Hilary Duff and Matthew Koma are seen walking in Soho on December 19, 2017 in New York City. (Photo by Raymond Hall/GC Images)
WEST HOLLYWOOD, CA - SEPTEMBER 15: Hilary Duff attends the 2017 Entertainment Weekly Pre-Emmy Party at Sunset Tower on September 15, 2017 in West Hollywood, California. (Photo by JB Lacroix/ WireImage)
LATE NIGHT WITH SETH MEYERS -- Episode 550 -- Pictured: Actress/singer Hilary Duff arrives on June 28, 2017 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - JUNE 27: Hilary Duff attends 'Younger' season four premiere party at Mr. Purple on June 27, 2017 in New York City. (Photo by Paul Bruinooge/Patrick McMullan via Getty Images)
NEW YORK, NY - JUNE 19: Singer/Actress Hilary Duff is seen is seen walking in Midtown on June 19, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JUNE 19: Singer/Actress Hilary Duff is seen is seen walking in Midtown on June 19, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JUNE 13: Actress Hilary Duff is seen filming 'Youger' in Union Square on June 13, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 12: Actress Hilary Duff is seen filming 'Younger' in Union Square on June 12, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 13: Actress Hilary Duff is seen filming 'Youger' in Union Square on June 13, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 12: Actress Hilary Duff is seen filming 'Younger' in Union Square on June 12, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - APRIL 26: Hilary Duff and Molly Bernard are seen filming 'Younger' on April 26, 2017 in New York, New York. (Photo by Alessio Botticelli/GC Images)
NEW YORK, NY - APRIL 05: Actress Actress Hilary Duff is seen walking in Soho on April 5, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - MARCH 07: Actress Hilary Duff attends a toast to Michele Promaulayko, the new Editor-In-Chief of Cosmopolitan, on March 7, 2017 in New York City. (Photo by Astrid Stawiarz/Getty Images for Cosmopolitan)
NEW YORK, NY - MARCH 07: Hilary Duff attends the Callie Collection Wines launch event with Hilary Duff at La Sirena on March 7, 2017 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Callie Collection)
LOS ANGELES, CA - FEBRUARY 28: Hilary Duff is seen on February 28, 2017 in Los Angeles, California. (Photo by BG015/Bauer-Griffin/GC Images)
LOS ANGELES, CA - FEBRUARY 22: Hilary Duff brightens up her blonde with celebrity hairstylist, Riawna Capri and Joico's Blonde Life on February 22, 2017 in Los Angeles, California. (Photo by Tiffany Rose/WireImage)
LOS ANGELES, CA - FEBRUARY 01: Hilary Duff is seen on February 01, 2017 in Los Angeles, California. (Photo by BG015/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JANUARY 28: Hilary Duff arrives at the Entertainment Weekly hosts celebration honoring nominees for The Screen Actors Guild Awards held at Chateau Marmont on January 28, 2017 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
WEST HOLLYWOOD, CA - JANUARY 27: Actress Hilary Duff attends Harper's Bazaar Celebrates 150 Most Fashionable Women at Sunset Tower Hotel on January 27, 2017 in West Hollywood, California. (Photo by Frazer Harrison/Getty Images)
LOS ANGELES, CA - JANUARY 09: Hilary Duff is seen on January 09, 2017 in Los Angeles, California. (Photo by BG009/Bauer-Griffin/GC Images)
BEVERLY HILLS, CA - JANUARY 08: Actress Hilary Duff arrives at the 18th Annual Post-Golden Globes Party hosted by Warner Bros. Pictures and InStyle at The Beverly Hilton Hotel on January 8, 2017 in Beverly Hills, California. (Photo by Gregg DeGuire/FilmMagic)
LOS ANGELES, CA - DECEMBER 08: Hilary Duff is seen on December 08, 2016 in Los Angeles, California. (Photo by BG015/Bauer-Griffin/GC Images)
LOS ANGELES, CA - NOVEMBER 13: Hilary Duff and Jason Walsh are seen at LAX on November 13, 2016 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 30: Actress Hilary Duff attends Entertainment Weekly's Popfest at The Reef on October 30, 2016 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - OCTOBER 27: Hilary Duff is seen on October 27, 2016 in Los Angeles, California. (Photo by BG005/Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 30: Actor Nico Tortorella and actress Hilary Duff attend Entertainment Weekly's Popfest at The Reef on October 30, 2016 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - SEPTEMBER 28: Singer/Actress Hilary Duff is seen walking in Soho on September 28, 2016 in New York City. (Photo by Raymond Hall/GC Images)
LOS ANGELES, CA - SEPTEMBER 29: Hilary Duff is seen at LAX on September 29, 2016 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
NEW YORK, NY - SEPTEMBER 27: Peter Hermann, Miriam Shor, Hilary Duff, Molly Bernard, Debi Mazar, Sutton Foster and Nico Tortorella attends the 'Younger' Season 3 & 'Impastor' Season 2 New York Premiere at Vandal on September 27, 2016 in New York City. (Photo by Walter McBride/FilmMagic)
NEW YORK, NY - SEPTEMBER 26: Hilary Duff attends the Build Series to discuss 'Younger' at AOL HQ on September 26, 2016 in New York City. (Photo by Mike Pont/WireImage)
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Navigating motherhood alongside her older sister has also proven to be a blessing for the "Younger" actress. After years of conquering the entertainment industry together (Haylie opened for Hilary on her Most Wanted tour back in 2004 and the sisters starred in 2006's "Material Girl" together), to be able to take the next steps in their lives together has been "awesome," but also surreal.

"We just stare at each other and we’re like, ‘Who are we?! How did this happen to us?'" Duff laughed. "We used to be like tearing through New York City and now she’s got milk coming out of her boobs, and I’m, like, trying to wrangle her kid into bed. It’s pretty funny."

"She’s always been my big sister, obviously, and she’s pretty protective of me, but a lot of things happened in my life first," she added. "I became a mom before her. Like, three years [before]. To watch her be a mom of two is very different than being a mom of one, though. It’s been cool to soak some of that up and see that that’s what is coming to me. She has daughters and I have a son, and that’s so different. Her kids are so sassy and I’m like, 'Is this what I have coming?'"

Being a mother has also encouraged the "Breathe In, Breathe Out" singer to give back to children in need more than she already was before. Duff told us that she's "always been philanthropic," noting that her mom instilled that quality in both her and her sister, but the importance of helping others has increased her desire to do things like Imagine If, With Jif, which encourages families to submit ideas creative, entrepreneurial ideas for a chance to be awarded $15,000 in funding. Duff sees the campaign, which is in partnership with the Boys and Girls Club of America, as a celebration of the incredible imaginations that all kids display throughout childhood.

"Kids are filled with so much potential and creativity," Duff gushed. "Not that that doesn't follow you into adulthood, but so many other blocks come in the way, so to facilitate those ideas now and inspire kids to speak up, be bold, be creative and make the world a better place for other kids was a no-brainer for me."

Families can submit their ideas to Imagine If, With Jif now through October 1 here.

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