On Friday, a Los Angeles commissioner approved the German supermodel’s application to adopt the surname of her singer hubby, crooner Seal — whose real name Seal Henry Olusegun Olumide Adeola Samuel. The couple tied the knot more than four years ago, and Heidi gave birth to their fourth child, daughter Lou, last month.

In her filing, Klum, 36, gave a one-word reason for the change: Marriage.

Meanwhile, Heidi wowed fashion fans when she walked the runway for the annual Victoria’s Secret Fashion Show in New York City Thursday night — just six weeks after giving birth!

Klum, 36, who gave birth to her fourth child just six weeks ago, had only been tapped to host the show but ultimately decided to walk the runway at last night’s showing, much to the delight of the crowd.

Wearing a corset and full skirt, the new mom smiled as she slowly took the runway for the surprise appearance. The event was the hottest ticket in the Big Apple, as the beautiful Victoria’s Secret Angels showed off elegant lingerie. The audience was packed with celebrities including Dr Dre and The Black Eyed Peas.

The 2009 Victoria’s Secret Fashion Show will air Dec. 1 @ 9PM on CBS.

The German supermodel, who welcomed daughter Lou with hubby Seal just three weeks ago, will continue her maternity leave by hosting this year’s event, fashion snoops tell E!.

No worries — you can still check out The Bejewelled Angels, along with musical guest The Black Eyed Peas, during The Victoria’s Secret Fashion Show, airing Tuesday, Dec. 1 on CBS.

Daughter Lou Sulola Samuel was born around shortly before 8 PM, Seal announced in a statement to the press.

Here’s what it says:
“It’s difficult to imagine loving another child as much as you love your existing children. Anyone who has a family will tell you this. Where will one find that extra love? If you love your existing children with all of your heart, how then can one possibly find more heart with which to love another?” Seal said.

“On Friday October ninth 2009 at 7:46pm, the answer to this question came in the form of our fourth child and second daughter. Lou Sulola Samuel was born and from the moment she looked into both of our eyes it was endless love at first sight. She is beautiful beyond words and we are happy that she chose us to watch her grow over the coming years.”

The 36-year-old German supermodel delivered a baby girl named Lou Samuel in Los Angeles at approximately 1AM this morning, RadarOnline reports.

The Project Runway host already has three children Leni, 4 (with Italian businessman Flavio Briatore), Henry Günther, 3, and Johan Riley, 2, with her crooner husband Seal.

Congrats to them!

The German supermodel and Project Runway host has filed a petition to change her last name to her married name, “Samuel.”

Heidi wed crooner Seal — whose full name is Seal Henry Olusegun Olumide — May 2005. The couple has two sons together, Henry Gunther Ademola Dashtu Samuel, 3, and Johan Riley Fyodor Taiwo Samuel, 2. Seal is also the adoptive father of Helene “Leni” Klum

The supermodel-turned-serial mom recently posed for a series of nude pictures for a soon-to-be-released coffee table book called Heidilicious, which she describes as “very naughty.”

Heidi teamed up with renowned photographer Rankin for the book, which is due to hit stores in October.

“It’s very naughty,” Heidi — who donned just a pair of socks for the cover — told LA Confidential Magazine this year.

The catwalk maven felt comfortable enough to disrobe during several shoots due to her long relationship with the photog.

“I’ve been shooting with this photographer, Rankin, for seven years, and working with him is fun because he always makes me look different. And he always gets me to take my clothes off for some reason,” she added. “We’ll do some job, and then he’ll say, ‘Why don’t we shoot some more things,’ and I’ll wind up without anything on.”

The 36-year-old is expecting a baby with singer husband Seal, but cautions that this is the last time they will extend their brood because they are now “outnumbered” by their children.

“We’re outnumbered. Four is perfect. Three is a lot. But four? It’s a lot of work. We’re hands-on, and we feel like this is what we can handle,” the Project Runway host told USA Today this week.

Klum says her glamorous life as a model was pushed aside when she became a mother because her three children – daughter Leni, five, and sons Henry, three, and Johan, two – have “taken over” the family home.

“They have taken over already. I’m not someone who is like, ‘Ok, this is a museum, and you can’t sit here and you can’t touch this and everything has to be put in its place.’ They live there as much as we do… You come into our house, and there is a giant elephant and lion to welcome you. We have those big stuffed animals, and we have toys and things everywhere,” she said.

Also be on the lookout for Models of the Runway, a new show about the lovelies who lend their slim figures to the designers of Project Runway.

Heidi Klum has been immortalized — in plastic!

On Wednesday, Mattel unveiled its special edition Barbie Doll honoring Victoria’s Secret’s own Heidi Klum. The German supermodel’s new doll, available in September 2009, is part of Barbie’s 50th Anniversary Blonde Ambition Collection, a series celebrating iconic blondes in fashion and entertainment.