Over the weekend, approximately fifty guests made their way to the home of Heidi Klum and husband Seal to celebrate their son Johan’s third birthday!

The party was train-themed and the two proud parents dressed in overalls and conductor hats along with their other three children – Leni, 5, Henry, 4, and 6-week-old baby Lou.

“They really got into the spirit of the whole train theme,” a source tells PEOPLE. “They always have so much fun together as a family.”

The couple’s LA home was decorated with red, blue, green and yellow balloons and a clown was there to entertain the kids. The guests also got to take a ride on a miniature train that was set up in the backyard.

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