The Voice coaches dressed down for the afternoon outing. Shelton, 39, wore a blue plaid shirt and dark jeans. The No Doubt frontwoman, 46, rocked a long-sleeve top and matching hat, and plaid shorts.
Shelton and Stefani have been out and about on several occasions since Us Weekly broke the news in November 2015 that they are dating. They've driven to the Voice set together, attended a Cardinals baseball game and let loose at an engagement party and wedding. (Us also exclusively revealed that Stefani will mentor Shelton's team next season.)
The pair, however, may not be the only rockstar couple collaborating on new songs. Shelton's ex-wife, Miranda Lambert, played music with new boyfriend Anderson East during a romantic getaway over the weekend. Us broke the news in December 2015 that the two are an item.
"Weekend well spent. @andersoneast," Lambert, 32, captioned an Instagram photo on Sunday, January 31. "#writin' #singin' #overallsandbeer #pencilandpaper #thecountry #weekendsoff #recharging #tennessee."
Can't get enough of Us? Sign up now for the Us Weekly newsletter packed with the latest celeb news, hot pics and more!