Brad Paisley and Carrie Underwood's duet, "Remind Me," has been certified as a gold single for 500,000 digital downloads. Paisley co-wrote the song with Chris DuBois and Kelley Lovelace. The track comes from Paisley's latest album, This Is Country Music, which was certified gold in June for shipments of 500,000 copies. Paisley will launch his European tour on Aug. 17 in London, while Underwood's next concert will be Aug. 12 in Ottawa, Ontario. As previously reported, Paisley and Underwood will co-host the CMA Awards on Nov. 9 in Nashville.