Brad Paisley and Carrie Underwood Rule the Charts

Country fans just can't forget about 'Remind Me,' Brad Paisley's hit duet with Carrie Underwood. This week, the song tops both the Billboard and Mediabase/Country Aircheck charts, giving Brad and Carrie their 20th and 14th No. 1 singles, respectively.

Since its release in May, the tune has been downloaded more than 750,000 times -- a number that speaks to the chemistry between the two singers. In addition to being close friends, they've teamed up three times to host the CMA Awards. On November 9, they'll make it four, presiding over the 45th anniversary show.

As Carrie revealed earlier this summer at the Billboard Country Music Summit, 'Remind Me' was something of a happy accident. It was only because Brad submitted his 'This Is Country Music' album late that the duo was able to make time for the recording session.

"It was the most unorganized thing I had ever been a part of," jokes Carrie. "I had never done anything like that before. It all worked out so perfectly. I was so happy. I felt like that was given to us. I was so excited about the song once the words became established and I was so happy he didn't deliver [his album] on time. It kept it in the moment, just doing it off the cuff. It wouldn't have been the same song had we recorded it and recorded it."

Brad and Carrie will almost certainly hear the name of their collaboration called when the 2011 CMA award nominations are announced one week from today (September 6) in Nashville and New York City.