Blake Shelton joins Gwen Stefani, her sons on road tripLos Angeles, Dec 12 (AZINS) Singer Gwen Stefani and her beau Blake Shelton are enjoying family bonding time before the Christmas holidays by going on a road trip.

The two celebrities, along with Stefani's ex-husband Gavin Rossdale's three sons - Kingston, 10, Zuma, 8, and Apollo, 2 -- have gone on a road trip to the mountains and were spotted walking in Lake Arrowhead, California, reports eonline.com.

Shelton was also seen drinking a beverage. The group reportedly later dined in a restaurant. The country singer wore a jacket. He completed his look with a blue button-down shirt, blue jeans, a two-toned blue cap and tan boots.

Stefani wore a California Republic state cap, a gold puffy coat, blue jeans and red boots.

Shelton has often spent time with Stefani's sons since the two went public with their relationship a year ago.

The two singers and stars of the TV show "The Voice" spent Thanksgiving together for the first time last month and made it a family affair.