Grand Theft Auto: Episodes from Liberty City includes both The Lost and Damned, and The Ballad of Gay Tony together and does not require the original Grand Theft Auto IV to play.

Now Available in North America and Brazil. Coming to the rest of world on April 16th.
Source Grand Theft Auto: Episodes from Liberty City includes both The Lost and Damned, and The Ballad of Gay Tony together and does not require the original Grand Theft Auto IV to play.

Now Available in North America and Brazil. Coming to the rest of world on April 16th.
Source