When does Whitney port go out with Alex from the City?

So i'm watching all the episodes from season 1 of the City and I just
watched the episode where Alex and Jay get into a fight at the club
because Alex thinks Jay is cheating on Whitney with his ex Danielle.
Anyways I just wanted to know what episode is it that Kelly introduces
Whitney to Alex and they go out? Is that the first episode of the City
or is that a part of Kelly's show Kell on Earth? I hope this isn't
confusing. Thank you :)