With Katie Holmes otherwise occupied, it seems Gwen Stefani is now filling Victoria Beckham's best friend vacancy.

The pair teamed up to take their sons on a power play date in Hollywood yesterday.

The boys – Brooklyn, 9, Romeo, 6, Cruz, 3, and Gwen's son Kingston, 2 – hit popular American pottery studio Colour Be Mine under the watch of their superstar mothers.

Gwen also took along her baby son Zuma, who was born in August, but managed to keep him out of the spotlight.

Of course Gwen and Posh do have a few things in common - as well as motherhood, both are singer turned fashion designers.

And while there's little contest when it comes to who has the most vocal talent, it seems Gwen also wins the style guru contest.

Just this week she was named the top celebrity fashion designer by American magazine InTouch.

Victoria came in fourth after Justin Timberlake and heiress Paris Hilton.

(c) Daily Mail