XXL has received an exclusive video of Kendrick Lamar's surprise performance during T.I.'s set at BET's SXSW.

Hip-hop fans were treated to a surprise performance at BET's "Music Matters" SXSW showcase last night when headliner T.I. brought out Kendrick Lamar to perform. The three-time XXL Award recipient and MTV's recently-crowned "Hottest MC in the Game" performed "Swimming Pools (Drank)" and "Backsteat Freestyle" off his acclaimed good kid, m.A.A.d city.

Earlier today, XXL reported that Kendrick will be hitting the road with Jay-Z as a part of Yahoo's "Yahoo! On the Road" tour.

Check out the full clip of the performance above.