Drake Spotted Singing Along at Ella Langley Concert in Arkansas

Drake traded rap-star mode for country-fan mode Saturday night ... showing up at Ella Langley\u2019s concert in North Little Rock, Arkansas.

The rapper was spotted in the crowd as the ACM Artist-Songwriter of the Year took the stage -- and he appeared to be totally into it ... as he was casted onto the big screen, singing along and dancing as she performed her hit, "Choosin\u2019 Texas."

Ella has become one of country music\u2019s biggest breakout stars over the past year, especially after her smash duet with Riley Green, "you look like you love me," shot up the charts and earned major awards-show attention.