Heidi Klum and boyfriend Vito Schnabel are taking a break: 'Things have been difficult recently'

Heidi Klum and Vito Schnabel are taking a break.

The 44-year-old supermodel and her boyfriend of over three years are "taking time apart right now" as Klum concentrates on her children, a source told People this week.

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"Things have been difficult recently," the source revealed. "They live on opposite coasts. And it's the start of the school year and Heidi had to concentrate on the kids."

Klum has four children. She shares Henry, 12, Johan, 10, and Lou, 7, with ex-husband Seal, and she is also mother to Leni, 13, whose father, Flavio Briatore, isn't involved in her life.

See photos of Heidi Klum and Vito Schnabel together:

33 PHOTOS
Heidi Klum and Vito Schnabel together
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Heidi Klum and Vito Schnabel together
WEST HOLLYWOOD, CA - FEBRUARY 26: Model Heidi Klum (L) and Vito Schnabel attend the 25th Annual Elton John AIDS Foundation's Academy Awards Viewing Party at The City of West Hollywood Park on February 26, 2017 in West Hollywood, California. (Photo by Kevin Mazur/Getty Images for EJAF )
NEW YORK, NY - FEBRUARY 08: Vito Schnabel and Heidi Klum attend the 19th Annual amfAR New York Gala at Cipriani Wall Street on February 8, 2017 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
PARIS, FRANCE - OCTOBER 21: Model Heidi Klum and Vito Schnabel leave the 'Brasserie Lipp' restaurant on October 21, 2016 in Paris, France. (Photo by Marc Piasecki/GC Images)
LOS ANGELES, CA - SEPTEMBER 21: Heidi Klum and Vito Schnabel are seen at LAX on September 21, 2016 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
NEW YORK, NY - SEPTEMBER 8: Heidi Klum and Vito Schnabel attend the women's semifinals during day 11 of the 2016 US Open at USTA Billie Jean King National Tennis Center on September 8, 2016 in the Queens borough of New York City. (Photo by Jean Catuffe/GC Images)
LONDON, ENGLAND - JULY 08: Heidi Klum and Vito Schnabel attend day eleven of the Wimbledon Tennis Championships at Wimbledon on July 08, 2016 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - JULY 08: Heidi Klum and Vito Schnabel attend day eleven of the Wimbledon Tennis Championships at Wimbledon on July 08, 2016 in London, England. (Photo by Karwai Tang/WireImage)
CAP D'ANTIBES, FRANCE - MAY 19: Vito Schnabel and Heidi Klum attend the amfAR's 23rd Cinema Against AIDS Gala at Hotel du Cap-Eden-Roc on May 19, 2016 in Cap d'Antibes, France. (Photo by Gisela Schober/Getty Images for amfAR )
BEVERLY HILLS, CA - FEBRUARY 28: Model Heidi Klum and Vito Schnabel arrive at the 2016 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
US-German model Heidi Klum and her boyfriend Vito Schnabel pose as they arrive to the 2016 Vanity Fair Oscar Party in Beverly Hills, California on February 28, 2016. / AFP / ADRIAN SANCHEZ-GONZALEZ (Photo credit should read ADRIAN SANCHEZ-GONZALEZ/AFP/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 28: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) Heidi Klum and Vito Schnabel attend the 2016 Vanity Fair Oscar Party Hosted By Graydon Carter at the Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by Kevin Mazur/VF16/WireImage)
BEVERLY HILLS, CA - FEBRUARY 28: (EXCLUSIVE ACCESS, SPECIAL RATES APPLY) Heidi Klum and Vito Schnabel attend the 2016 Vanity Fair Oscar Party Hosted By Graydon Carter at the Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by Kevin Mazur/VF16/WireImage)
MILAN, ITALY - SEPTEMBER 26: Kenneth Cole, Heidi Klum and Vito Schnabel are seen at amfAR Milano 2015 at La Permanente on September 26, 2015 in Milan, Italy. (Photo by Victor Boyko/Getty Images for Harry Winston)
WEST HOLLYWOOD, CA - FEBRUARY 28: Vito Schnabel (L) and tv personality Heidi Klum attend the 24th Annual Elton John AIDS Foundation's Oscar Viewing Party at The City of West Hollywood Park on February 28, 2016 in West Hollywood, California. (Photo by Dimitrios Kambouris/Getty Images for EJAF)
MILAN, ITALY - SEPTEMBER 26: Vito Schnabel and Heidi Klum attend amfAR Milano 2015 at La Permanente on September 26, 2015 in Milan, Italy. (Photo by Jacopo Raule/Getty Images for amfAR)
MILAN, ITALY - SEPTEMBER 26: Heidi Klum and boyfriend Vito Schnabel are seen during Milan Fashion Week Spring/Summer 2016 on September 26, in Milan, Italy. (Photo by Robino Salvatore/GC Images)
MILAN, ITALY - SEPTEMBER 26: Heidi Klum and Vito Schnabel are seen at amfAR Milano 2015 at La Permanente on September 26, 2015 in Milan, Italy. (Photo by Jacopo Raule/Getty Images for amfAR)
LOS ANGELES, CA - SEPTEMBER 18: Heidi Klum and Vito Schnabel attend The Broad museum's inaugural celebration September 18, 2015, in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
NEW YORK - MAY 16: Heidi Klum and Vito Schnabel are seen leaving the ÃFirst Show/Last Show ' exhibition in Soho on MAY 16, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
LOS ANGELES, CA - SEPTEMBER 18: Heidi Klum and Vito Schnabel attend The Broad Museum inaugural celebration at The Broad on September 18, 2015 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
NEW YORK, NY - MAY 07: Vito Schnabel and Heidi Klum are seen on May 7, 2015 in New York City. (Photo by Alo Ceballos/GC Images)
LOS ANGELES, CA - FEBRUARY 22: Heidi Klum and Vito Schnabel attend the 23rd Annual Elton John AIDS Foundation Academy Awards Viewing Party on February 22, 2015 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for EJAF)
LOS ANGELES, CA - FEBRUARY 22: Vito Schnabel and Heidi Klum attend the 23rd Annual Elton John AIDS Foundation Academy Awards Viewing Party on February 22, 2015 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for EJAF)
NEW YORK, NY - MAY 07: Vito Schnabel and Heidi Klum are seen on May 7, 2015 in New York City. (Photo by Alo Ceballos/GC Images)
NEW YORK, NY - FEBRUARY 11: Heidi Klum, Vito Schnabel and Karlie Kloss attend the 2015 amfAR New York Gala at Cipriani Wall Street on February 11, 2015 in New York City. (Photo by Kevin Tachman/Getty Images)
NEW YORK, NY - FEBRUARY 11: Heidi Klum (L) and Vito Schnabel attend the 2015 amfAR New York Gala at Cipriani Wall Street on February 11, 2015 in New York City. (Photo by Jamie McCarthy/WireImage)
CAP D'ANTIBES, FRANCE - MAY 22: Heidi Klum and Vito Schnabel attend amfAR's 21st Cinema Against AIDS Gala Presented By WORLDVIEW, BOLD FILMS, And BVLGARI at Hotel du Cap-Eden-Roc on May 22, 2014 in Cap d'Antibes, France. (Photo by Gisela Schober/German Select for Mercedes-Benz)
CAP D'ANTIBES, FRANCE - MAY 22: Heidi Klum and Vito Schnabel attend amfAR's 21st Cinema Against AIDS Gala Presented By WORLDVIEW, BOLD FILMS, And BVLGARI at Hotel du Cap-Eden-Roc on May 22, 2014 in Cap d'Antibes, France. (Photo by Gisela Schober/German Select for Mercedes-Benz)
CANNES, FRANCE - MAY 21: (ITALY-OUT) (L to R) Heidi Klum, Oscar Generale and Vito Schnabel attend the welcome party for Puerto Azul Experience Night at Villa St George on May 21, 2014 in Cannes, France. (Photo by David M. Benett/Getty Images for Puerto Azul)
CAP D'ANTIBES, FRANCE - MAY 22: Vito Schnabel (L) and Heidi Klum attend amfAR's 21st Cinema Against AIDS Gala presented by WORLDVIEW, BOLD FILMS, and BVLGARI at Hotel du Cap-Eden-Roc on May 22, 2014 in Cap d'Antibes, France. (Photo by Dave M. Benett/amfAR14/WireImage)
CANNES, FRANCE - MAY 21: (ITALY-OUT) (L to R) Heidi Klum, Vito Schnabel, Adrien Brody and Lara Lieto attend the welcome party for Puerto Azul Experience Night at Villa St George on May 21, 2014 in Cannes, France. (Photo by David M. Benett/Getty Images for Puerto Azul)
CANNES, FRANCE - MAY 21: Vito Schnabel and Heidi Klum attend the Roberto Cavalli yacht party at the 67th Annual Cannes Film Festival on May 21, 2014 in Cannes, France. (Photo by Luca Teuchmann/Getty Images)
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The revelation about Klum and Schnabel's relationship status comes after Klum attended a party with friend Louis Hamilton during New York Fashion Week. Earlier this summer, Schnabel had to release a statement to dispel rumors that he was cheating on Klum after photos emerged of him kissing a female friend goodnight.

"The claims that have been made are a misrepresentation of an entirely innoccent situation. There is nothing more to this than I was simply saying goodnight to a family friend and we went on our separate ways," he said in June.

Klum was married to Seal for nearly 10 years before the A-listers got divorced in 2014. 

Klum and Schnabel, 30, were definitely together this summer, when they were photographed soaking up the sun in St. Tropez together. For more on their trip, watch the video above.

See more photos of Heidi Klum:

31 PHOTOS
Heidi Klum out and about
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Heidi Klum out and about
NEW YORK, NY - SEPTEMBER 08: Heidi Klum attends 2017 Harper's Bazaar Icons at The Plaza Hotel on September 8, 2017 in New York City. (Photo by Sean Zanni/Patrick McMullan via Getty Images)
NEW YORK, NY - SEPTEMBER 08: Heidi Klum attends 2017 Harper's Bazaar Icons at The Plaza Hotel on September 8, 2017 in New York City. (Photo by Sean Zanni/Patrick McMullan via Getty Images)
NEW YORK, NY - SEPTEMBER 08: Heidi Klum attends Harper's BAZAAR Celebration of 'ICONS By Carine Roitfeld' at The Plaza Hotel presented by Infor, Laura Mercier, Stella Artois, FUJIFILM and SWAROVSKI on September 8, 2017 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Harper's BAZAAR)
NEW YORK, NY - SEPTEMBER 08: Lewis Hamilton, Heidi Klum and Swizz Beatz attend 2017 Harper's Bazaar Icons at The Plaza Hotel on September 8, 2017 in New York City. (Photo by Sean Zanni/Patrick McMullan via Getty Images)
NEW YORK, NY - SEPTEMBER 08: Heidi Klum greets the audience during the Project Runway Fashion Show at Gallery 1, Skylight Clarkson Sq on September 8, 2017 in New York City. (Photo by Thomas Concordia/WireImage)
NEW YORK, NY - SEPTEMBER 08: Supermodel Heidi Klum poses backstage at the Project Runway fashion show during New York Fashion Week: The Shows at Gallery 1, Skylight Clarkson Sq on September 8, 2017 in New York City. (Photo by Dimitrios Kambouris/Getty Images For NYFW: The Shows)
2017 MTV Video Music Awards ? Arrivals ? Inglewood, California, U.S., 27/08/2017 - Heidi Klum. REUTERS/Danny Moloshok
LOS ANGELES, CA - MARCH 25: Heidi Klum celebrates Elton John's 70th Birthday and 50-Year Songwriting Partnership with Bernie Taupin benefiting the Elton John AIDS Foundation and the UCLA Hammer Museum at RED Studios Hollywood on March 25, 2017 in Los Angeles, California. (Photo by Michael Kovac/Getty Images)
LOS ANGELES, CA - MARCH 25: Heidi Klum celebrates Elton John's 70th Birthday and 50-Year Songwriting Partnership with Bernie Taupin benefiting the Elton John AIDS Foundation and the UCLA Hammer Museum at RED Studios Hollywood on March 25, 2017 in Los Angeles, California. (Photo by Michael Kovac/Getty Images)
NEW YORK, NY - JULY 06: Model Heidi Klum is walking in Soho on July 6, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JULY 06: Model Heidi Klum is walking in Soho on July 6, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JULY 06: Model Heidi Klum is walking in Soho on July 6, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JULY 06: Heidi Klum seen out in Manhattan after attending a morning tv show on July 6, 2017 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - JULY 06: Model Heidi Klum is seen in Tribeca on July 6, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JULY 06: Model Heidi Klum is seen in Tribeca on July 6, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 27: Model Heidi Klum is seen in Tribeca on June 27, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 23: Heidi Klum is seen on June 23, 2017 in New York City. (Photo by Tal Rubin/GC Images)
NEW YORK, NY - JUNE 23: Heidi Klum is seen on June 23, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 23: Heidi Klum is seen on June 23, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 21: Model Heidi Klum is seen walking in Soho on June 21, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JUNE 21: Model Heidi Klum is seen walking in Soho on June 21, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JUNE 13: Heidi Klum and her kids seen out in Manhattan on June 13, 2017 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - JUNE 13: Heidi Klum and her kids seen out in Manhattan on June 13, 2017 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - JUNE 12: Model Heidi Klum is seen in Queens on June 12, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 12: Heidi Klum and daughter Leni are seen on June 12, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 12: Model Heidi Klum is seen in Queens on June 12, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 12: Heidi Klum is seen on June 12, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 06: Heidi Klum celebrates Heidi Klum By Rankin at Bookmarc on June 6, 2017 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Heidi Klum)
NEW YORK, NY - JUNE 06: Heidi Klum and Tim Gunn does a photoshoot for Project Runway together on June 6, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - JUNE 06: Heidi Klum does a photoshoot in a canary yellow Zac Posen dress for Project Runway on June 6, 2017 in New York City. (Photo by Gotham/GC Images)
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