The exes remain close, co-parenting their son, Luca, together.See more photos of Hilary Duff through the years: NEW YORK, NY - JUNE 23: Actress Hilary Duff joins Stella Artois to help kick-off a summer of hosting memorable moments in New York City on June 23, 2016.It's clear that their split is amicable, as their rep shared in a statement: "They remain best friends and will continue to be in each other's lives.
(Photo by Kevin Winter/Getty Images)MEXICO CITY - OCTOBER 18: Singer Hilary Duff performs onstage during the Los Premios MTV Latin America 2007 at the Palacio De Los Deportes October 18, 2007 in Mexico City, Mexico.
(Photo by Kevin Winter/Getty Images)NEW YORK - MAY 05: Actress/singer Hilary Duff (L) and NHL player Mike Comrie arrive at the Metropolitan Museum of Art Costume Institute Gala, Superheroes: Fashion and Fantasy, held at the Metropolitan Museum of Art on May 5, 2008 in New York City.
Later the pair went out for a dinner date in Tribeca, changing into more high fashion ensembles with Duff in a checkered grey dress and thigh-high pink boots.
On Sunday the duo were spotted out together again, grabbing some pizza for lunch.
SEPTEMBER 15: Musician Hilary Duff is seen performing on stage during the 2004 World Music Awards at the Thomas and Mack Center on September 15, 2004 in Las Vegas, Nevada.
(Photo by Kevin Winter/Getty Images)NEW YORK - OCTOBER 5: (U. TABS OUT) Actress and musician Hilary Duff appears on stage during MTV's Total Request Live at the MTV Times Square Studios October 5, 2004 in New York City.
(Photo by Scott Gries/Getty Images)MIAMI - AUGUST 29: Singer/actress Hilary Duff poses in the press room at the 2004 MTV Video Music Awards on August 29, 2004 at the American Airlines Arena, in Miami, Florida.
(Photo by Peter Kramer/Getty Images)LAS VEGAS, NV ?
(Photo by Craig Barritt/Getty Images for Stella Artois)Actors Hilary Duff (L) and Sutton Foster with producer Darren Star (C) attend the 'Younger' Season 3 and 'Impastor' Season 2 New York Premiere at Vandal on September 27, 2016 in New York City.
/ AFP / ANGELA WEISS (Photo credit should read ANGELA WEISS/AFP/Getty Images)WEST HOLLYWOOD, CA - APRIL 15: Actresses Sutton Foster, Miriam Shor and Hilary Duff of TV Lands Younger attend the 'Younger' FYC Screening & Reception at The London West Hollywood on April 15, 2016 in West Hollywood, California.
(Photo by Scott Gries/Getty Images)NEW YORK - FEBRUARY 17: Sisters Haylie Duff (L) and Hilary Duff (R) make an appearance at Milk Studios to debut their advertising campaign for Ice Breakers Liquid Ice February 17, 2005 in New York City.