Gwen Stefani and Blake Shelton certainly still have a spark after dating for four years.

The blonde bombshell - who will turn 50-years-old in October - looked youthful in a tank top and Daisy Duke shorts as she crooned alongside her 43-year-old beau on Sunday.

The two were heating up the stage at the California Mid-state Fair in Paso Robles, California, which is between San Francisco and Los Angeles.Stefani was fully made up for the gig with her bleach blonde hair nicely styled and bright ruby red lipstick which is her signature.

And her outfit was country siren meets punk rock queen as she wore a fringed vest over a black tank top with Daisy Duke shorts and fishnet stockings.

Her floral cowgirl boots were cheerful.Shelton, who has a habit of under-dressing, kept it country cool in a shirt and jeans.The entire time on stage, Blake worked his magic as he made his pretty lady love smile and laugh.Together they seem to have a certain charisma as he charms the pinup and loosens her up.

The pair began dating when they worked together on The Voice. She took a hiatus but is now back on the hit show as a judge for season 17, replacing Adam Levine.She recently celebrated her four-year anniversary with Shelton.

He told People: 'It's actually shocking that it has already been that long.'It's kind of a blur. It still feels like it's pretty new to me. I guess it is, relatively. Four years isn't forever, but man, it seems like it just happened in no time.'The No Doubt frontwoman has three sons from ex-husband Gavin Rossdale: Kingston, 13, Zuma, 10, and Apollo, five.Stefani was married to Rossdale, 53, from 2002 until 2016, divorcing over 'irreconcilable differences.'