Gwen Stefani was her usual cool self when she attended 102.7 KIIS FM's Wango Tango concert in Carson, CA, on Saturday evening. The singer, who was one of the performers at the event, gave fans a glimpse of her toned tummy in a sheer top while striking a bevy of fun poses on the red carpet. She also caught up with ET and opened up about her recent performance on The Voice with boyfriend Blake Shelton, saying, "Anytime I've ever collaborated with anyone, it's always my favourite, but to do something with him — because he's so talented and comes from such a different world — to make music together, it was just so shocking! So amazing to do it live and share it with everybody." Keep reading to see more of her night, and then check out Gwen and Blake's cutest moments together.