Christina Aguilera and Nicole Richie throw party

Christina Aguilera and Nicole Richie threw a joint birthday party for their children on Saturday (17.01.09).

The 'Dirrty’ singer and her husband, music executive Jordan Bratman, invited 40 guests to their Beverly Hills home on Saturday (17.01.09) to celebrate the first birthdays of their son Max Liron and Harlow Winter Kate, Nicole's daughter.

Max was born on 12 January 2008, the day after Nicole gave birth to Harlow.

A source said: 'The party was inspired by the children’s book 'Where The Wild Things Are’, so Christina and Jordan got people dressed as the characters to come along and surprise the kids.

'Everyone was out in the garden, which had multi-coloured balloons tied to all the tress and looked great. All the guests had a wonderful time, and Max and Harlow loved the attention.'

Los Angeles caterers Along Came Mary supplied child-friendly food for the bash, including peanut butter-and-jam sandwiches.