Gwen Stefani -- I'm the Hottest Soccer Mom ... No Doubt

Gwen Stefani was looking hella good at her son's soccer game Saturday ... and single-handedly blew away the other soccer moms standing within a 100-yard radius.

The 45 year-old No Doubt singer was in Studio City cheering on Kingston while holding onto his younger bro Apollo. It's almost freakish how she doesn't age, especially with 3 kids.