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Heidi Klum keeps it chic while taking her kids – Leni, 9, Henry, 8, Johan, 7, and Lou, 4 – to a workout session at JAG Gym on Sunday (February 2) in Culver City, Calif.

The night before, the 40-year-old Project Runway host was fierce in leather while arriving on a flight at LAX Airport.

PHOTOS: Check out the latest pics of Heidi Klum

Earlier in the week, Heidi showed some leg while attending Howard Stern‘s 60th Birthday Bash in New York City.

“Download the #NewU2Song ‘Invisible’ for FREE now and $1 goes to support @RED’s fight against AIDS,” Heidi recently tweeted.

25+ pictures inside of Heidi Klum spending time with her kids after landing at LAX Airport…More Here! »

Heidi Klum dons a cute top while grabbing Starbucks coffee before heading to JAG Gym on Sunday (January 19) in Brentwood, Calif.

The 40-year-old Project Runway host was joined by her kids – Leni, 9, Henry, 8, and Johan, 7.

PHOTOS: Check out the latest pics of Heidi Klum

The day before, Heidi was trendy chic while shopping for sporting goods after a soccer game.

Earlier in the week, Heidi was red hot while attending the 50th Anniversary of the Sports Illustrated Swimsuit Issue Party in Hollywood.

FYI: Heidi is wearing the Elizabeth and James Boxy Pullover sweater.

25+ pictures inside of Heidi Klum spending time with her kids on two different days…More Here! »

Heidi Klum keeps it cool and casual while doing some Christmas shopping with her daughter Leni, 9, on Sunday (December 22) in Santa Monica, Calif.

That same day, the 40-year-old Project Runway host was spotted cruising around in a large black Ford truck with her boyfriend and bodyguard Martin Kirsten.

PHOTOS: Check out the latest pics of Heidi Klum

“This year for the first time [the kids] each have their own tree in their room,” Heidi told People while hosting a Creativity Holiday Party at Children’s Hospital Los Angeles. “That’s a lot of trees, I know. They were taking photos of us when we left the lot, and they were like, ‘Oh my gosh, they’ve got the whole forest!’ But it’s because I have so many kids!”

10+ pictures inside of Heidi Klum out and about…More Here! »

Heidi Klum dons a bold jacket while visiting Santa Claus with her kids – Leni, 9, Henry, 8, Johan, 7, and Lou, 4 – at The Grove on Saturday (December 21) in Los Angeles.

The 40-year-old Project Runway host was joined by her boyfriend and bodyguard Martin Kirsten.

PHOTOS: Check out the latest pics of Heidi Klum

Earlier in the week, Heidi was all smiles while visiting the Children’s Hospital for a Truly Scrumptious for Babies “R” Us and Paper and Pencil by FiftyThree event.

FYI: Heidi is wearing the Elizabeth and James Erwan Leather Jacket.

10+ pictures inside of Heidi Klum and Martin Kirsten taking the kids to see Santa Claus…More Here! »

Heidi Klum treats her daughters Leni, 9, and Lou, 4, to dinner at Cecconi’s on Sunday (December 8) in Beverly Hills, Calif.

The 40-year-old model, who was accompanied by beau Martin Kirsten, also brought along a group of Leni‘s pals, who were all dressed in the same coat! Earlier in the day, she brought the kids ice skating.

“Not sure who had more fun ice skating…… the kids or me !!!!” Heidi tweeted.

The day before, Heidi and Lou were spotted having lunch at Toscana in Brentwood.

Earlier in the weekend, Heidi picked up coffee with Martin in Brentwood.

FYI: Lou is wearing a ban.do party crasher headband while out on Sunday. Heidi is wearing an Elizabeth and James bordeaux fleece coat.

15+ pictures inside of Heidi Klum spending the weekend with her daughters…More Here! »

Heidi Klum heads out from lunch at Cecconi’s with her parents on Sunday afternoon (December 1) in West Hollywood, Calif.

The 40-year-old Project Runway host was also joined by her children Johan, 7, Lou, 4, and Leni, 9. They all stopped by John Varvatos for a little retail therapy too.

PHOTOS: Check out the latest pics of Heidi Klum

“Shopping with Mom and Dad,” she tweeted with a cute pic of her parents. See it below!

Later that night, Heidi and Leni were spotted leaving Mr Chow together after grabbing a bite to eat in Beverly Hills.

35+ pictures inside of Heidi Klum and her family out and about…More Here! »

Heidi Klum keeps it all natural while grabbing a bite to eat at Cecconi’s on Saturday (November 30) in West Hollywood, Calif.

The 40-year-old Project Runway host was joined by boyfriend Martin Kirsten and children – Leni, Henry, and Johan.

PHOTOS: Check out the latest pics of Heidi Klum

Earlier in the week, Heidi sported a cool pair of sunglasses while filming a segment for Germany’s Next Top Model.

Last weekend, Heidi donned a black dress while attending the 2013 American Music Awards, where she was a presenter.

25+ pictures inside of Heidi Klum and Martin Kirsten heading out for lunch…More Here! »