Funnyman Will Ferrell has some advice for new parents Keith Urban and Nicole Kidman.

"Talk to your children at least once a week," Ferrell joked to PEOPLE magazine at the premiere of his new movie, 'Step Brothers.' "If you've got time, do it two or three times a week . . . But otherwise, I find the times where I let weeks and weeks go by without talking to my children, that adds up."

Ferrell, the father of two young sons himself, was kidding, of course. But he says his sense of humor isn't rubbing off on his kids. Asked if 4-year-old Magnus and 1-year-old Mattias are little comedians themselves, Ferrell responded, "No, they're not funny. They're deadly serious."

Kidding again . . . hopefully!

PEOPLE actually broke the news to Ferrell about the July 7 birth of Urban and Kidman's daughter, Sunday Rose Kidman Urban. He offered his 'Bewitched' co-star and her country crooning husband a hearty congratulations.

Born to Rock

    Actress Nicole Kidman and husband singer Keith Urban attend the 43rd Academy of Country Music Awards at The MGM Grand Garden Arena on May 18, 2008 in Las Vegas, Nevada.

    Jon Kopaloff,FilmMagic.com

    Usher holding his son, Usher Raymond V, and Benny Medina attend Usher Tapes MTV Promo at a private recording studio on May 18, 2008 in New York City.Usher Tapes a Promo for MTV

    Photo by Johnny Nunez,WireImage.com

    Musicians GWEN STEFANI and GAVIN ROSSDALE and their son Kingston Rossdale visit the LACMA museum on April 5, 2008 Los Angeles, California. (Photo by Jean Baptiste Lacroix/WireImage.com)

    In a world exclusive, PEOPLE magazine has the first photos of the 1-month old twin babies of JENNIFER LOPEZ and MARC ANTHONY. In the accompanying cover story, Lopez dishes on her pregnancy. (Photo by People Magazine)

    CHRISTINA AGUILERA on the cover of People Magazine with her new baby. (Photo by People Magazine)

    NICOLE RICHIE with JOEL MADDEN carrying baby 2-month-old daughter Harlow. (Photo by X17online)

    CHRIS MARTIN carrying baby Apple in Brentwood March 25, 2007 (Photo by X17online)

    NATALIE MAINES and her son Slade arrived at the World Premiere of 'Pirate Of The Caribbean: At World's End' at Disneyland in Anaheim, California May 19, 2007. (Photo by X17online)

    SEAN COMBS in Hollywood May 2, 2008 (X17online exclusive)

    Scary Spice MELANIE BROWN with her daughters Pheonix and Angel before leaving London's Heathrow Airport for the next leg of the Spice Girl tour. (Photo by CAMERA PRESS / David Dyson)

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