"I don't know when," the 32-year-old actress, who is currently filming The Girl on the Train in New York City, revealed in August. "We've got to give [Hazel] some competition at some point."
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BEVERLY HILLS, CA - AUGUST 13: Actors John Krasinski and Emily Blunt attend HFPA Annual Grants Banquet at the Beverly Wilshire Four Seasons Hotel on August 13, 2015 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
NEW YORK, NY - OCTOBER 08: Emily Blunt and husband John Krasinski pose at The Opening Night of the MTC production of Sam Shepard's 'Fool For Love' on Broadway at The Samuel J. Friedman Theatre on October 8, 2015 in New York City. (Photo by Bruce Glikas/FilmMagic)
TORONTO, ON - SEPTEMBER 11: Actors John Krasinski and Emily Blunt attend the 'Sicario' premiere during the 2015 Toronto International Film Festival at Princess of Wales Theatre on September 11, 2015 in Toronto, Canada. (Photo by George Pimentel/WireImage)
LOS ANGELES, CA - JANUARY 15: Actors John Krasinski (L) and Emily Blunt attend the 20th annual Critics' Choice Movie Awards at the Hollywood Palladium on January 15, 2015 in Los Angeles, California. (Photo by Tiffany Rose/Getty Images for Pol Roger Champagne and 1928 Prosecco)
LOS ANGELES, CA - JANUARY 15: Actor John Krasinski and wife actress Emily Blunt arrive at the 20th Annual Critics' Choice Movie Awards at Hollywood Palladium on January 15, 2015 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
NEW YORK, NY - DECEMBER 07: (EXCLUSIVE COVERAGE) (L-R) Jon Hamm, Jennifer Westfeldt, John Krasinski and Emily Blunt pose at The Opening Night After Party for ''Elephant Man' on Broadway at Gotham Hall on December 7, 2014 in New York City. (Photo by Bruce Glikas/FilmMagic)
HOLLYWOOD, CA - NOVEMBER 08: Actor John Krasinski (L) and actress Emily Blunt attend the Academy Of Motion Picture Arts And Sciences' 2014 Governors Awards at The Ray Dolby Ballroom at Hollywood & Highland Center on November 8, 2014 in Hollywood, California. (Photo by Steve Granitz/WireImage)
VENICE, ITALY - SEPTEMBER 26: Emily Blunt and John Krasinski are seen on September 26, 2014 in Venice, Italy. George Clooney is set to marry his lawyer fiancee Amal Alamuddin this weekend in Venice where they met. (Photo by Robino Salvatore/GC Images)
BEVERLY HILLS, CA - JANUARY 13: Actors Emily Blunt and John Krasinski arrive at the 70th Annual Golden Globe Awards held at The Beverly Hilton Hotel on January 13, 2013 in Beverly Hills, California. (Photo by Jeff Vespa/WireImage)
SANTA MONICA, CA - JANUARY 10: Actors Emily Blunt and John Krasinski arrive at the 18th Annual Critics' Choice Movie Awards at The Barker Hanger on January 10, 2013 in Santa Monica, California. (Photo by Jeffrey Mayer/WireImage)
SANTA MONICA, CA - JANUARY 10: (L-R) Actors Emily Blunt, John Krasinski and Joseph Gordon-Levitt attend the Critics' Choice Movie Awards 2013 with Champagne Nicolas Feuillatte at Barkar Hangar on January 10, 2013 in Santa Monica, California. (Photo by Tiffany Rose/WireImage)
TORONTO, ON - SEPTEMBER 06: Actress Emily Blunt (R) and husband actor John Krasinski attend the 'Looper' opening night gala premiere during the 2012 Toronto International Film Festival on September 6, 2012 in Toronto, Canada. (Photo by George Pimentel/Getty Images)
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Meanwhile, the former Office star recently gushed over his wife, adorably stating, "The best days of my life started when I met my wife."
"That's the truth, it's not just me saying it because it sounds nice on a card," Krasinski, 36, told The Daily Beast. "She's one of the coolest people, she's so talented, she's beautiful, and she's certainly out of my league...When you're lucky enough to meet your one person then life takes a turn for the best. It can't get better than that."