Heidi Klum & Seal Throw Train-Themed Party for Son

Heidi Klum & Seal Throw Train-Themed Party for Son
Heidi Klum
Jill Johnson/JPI

11/23/2009 AT 02:20 PM EST

About 50 guests came out over the weekend to celebrate Heidi Klum and Seal's son Johan's 3rd birthday at their Los Angeles-area home with a train-themed party.

The model and her musician husband dressed in overalls and conductor hats along with the rest of their brood, which includes daughter Leni, 5; son Henry, 4; and newborn daughter Lou, six weeks.

"They really got into the spirit of the whole train theme," says a source. "They always have so much fun together as a family."

Guests were greeted at the house by red, blue, green and yellow balloons decorating the driveway, and once inside rode on a mini-choo-choo train in the backyard. A clown also entertained the kids.

Klum, who gave birth to daughter Lou six weeks ago, looked "fantastic," according to the source – just as she did last week during her surprise trip down the runway at a Victoria's Secret show in New York.


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