Lean on me! Heidi Klum lounges with boyfriend Martin Kristen as they steal a romantic moment on family day out

She went public with their romance only five months ago, even then stopping short of calling what they have a 'relationship'.
And after months of being tight-lipped about their budding romance, it seems Heidi Klum is finally comfortable displaying her affection for her new boyfriend, Martin Kristen.
The German supermodel tenderly laid her head on his lap as the couple soaked up the gorgeous weather in Los Angeles on Sunday with her four children.

Day in the sun: Heidi Klum and boyfriend Martin Kristen relaxed at the beach in Santa Monica, California on Sunday

The 39-year-old beauty looked as though she had fallen into a zen-like state as she smiled under his gaze.
The couple were later seen taking a stroll, while Heidi leaned on the shoulder of her former bodyguard, turned boyfriend.

With her guys: Heidi lounged while her kids played in the sand and on the turf nearby

Standing by her man: Heidi leaned on Martin for a little support while the couple looked on at her kids

It was a perfect family day for the pair, who hit the beach in Malibu with three-year-old Lou, boys, Johan, six, and Henry, seven, and eight-year-old Leni.
The boys were quick to leave their family in search of adventure.
Leni stayed close to her mother as they strolled around nearby shops, and her daughter hopped off her bike to stroll between Heidi and Martin.

Family fun day: Heidi Klum and boyfriend Martin Kristen took her children, Henry, Johann, Leni, pictured, and Lou to Santa Monica Boardwalk in Santa Monica, California, on Sunday

Family fun day: Heidi and Martin also took her children, Henry, Johann, Leni, pictured, and Lou to Santa Monica Boardwalk in Santa Monica

It was a weekend of outdoor activities for Heidi Klum and her adorable brood as they made the most of California's warm weather.
Still, the couple managed to steal some alone time, thanks in part to Heidi's mother, Erna, who at times was seen looking after her youngest.
While Los Angles is quickly leaving winter behind, it seemed Heidi was not quite ready to shed her warmer clothes.

Big operation: The couple had to join forces to get the kids and their bikes and scooters unpacked

Mummy's girl: While the boys went off to find adventure eight-year-old Leni stayed by her mum's side

Hands on: Martin has devoted himself to the children since his and Heidi's relationship turned romantic
For the family's outing, the German stunner donned long black silk pants with a white print, a black T-shirt with large white polka dots and covered up with a long woolen coat and scarf.
Looking casual but chic in a way only models can, the Project Runway host wore her hair tied back in an unfussy bun and added a striking pop of colour with red lipstick.
Her bodyguard beau also looked good showing off his muscular physique in a grey V-neck that he wore with jeans.

Keeping close: Heidi and Martin were spotted constantly at each other's side
At one point the family took some time out from their walk and sat down by the beach.
As Heidi and Martin sat closely to each other trying to get a little time together, bundle of energy Henry showed off his gymnastic skills.
The seven-year-old expertly balanced and walked along a narrow railing to impress his mother and her partner.

Loving embrace: Heidi and Leni shared a hug after her bike ride

Martin has taken a very hands on role with the children since his relationship with Heidi turned romantic.

And with four excitable children, Heidi will surely take all of the help she can get.
With four children, their bikes, their scooters and helmets, the couple had their hands full as they unpacked the massive van needed to get the family down to the beach.

Lots to do: After their ride, the group played in the sand

Showing off his skills: Henry carefully balanced on a narrow rail, putting on a show for his mother

Sunday's fun comes after an action packed weekend for the large family.
On Saturday they were once again outdoors for the children's soccer games.
For the game, the German-born model get into the swing of the hotter weather wearing the very spring time ensemble of a floral print maxi dress with flat-heeled sandals.