As the mother of two children, Nicole Richie's party days are more or less over.
But she made an exception for her son Sparrow's first birthday.
The reality TV star and her partner Joel Madden decked their home out in red, green, orange and purple "Happy Birthday" balloons for the occasion.
About 50 guests, including actress Ellen Pompeo and her daughter Stella Luna, 11 months, joined the fun in the garden of their Hollywood Hills villa.
As, of course, did his big sister Harlow, who is two and a half.
"Nicole was keeping the party simple to not overwhelm Sparrow," a source told People. "Everyone seemed to have a great time."
Sparrow turns one on September 9.