Season 4: Episode 78: The One With Joey's New Girlfriend
Chandler meets a very attractive girl, only to discover that she's dating Joey. As he gets to know Kathy better, Chandler's feelings grow deeper. Even though Joey appears to have no strong attachment to his new girlfriend, Chandler cannot help but respect that Kathy's his best friend's girl. Meanwhile, Rachel and Ross go out of their way to make each other jealous by mentioning their new love interests. Josh, Rachel's much younger beau, ends up stealing from her while Ross turns out to be nothing more than a baby-sitter for his new girlfriend Amanda. Phoebe's cold has turned her singing voice from high-pitched and whiny to sexy and sultry. When she recovers, she desperately tries to catch another cold.