Episode: 4x14 (Season 4 Episode 14) Name: Sad Songs for Dirty Lovers Originally Aired: Feb. 14, 2007 Plot: Haley finds out about the stolen calculus test and confronts Brooke about it. As Peyton and Brooke continue to mend their relationship, Lucas and Peyton consider taking theirs to the next level. Meanwhile, with Deb away, Nathan throws a party for the senior class at his mother's house during which a sex tape from his past is exposed.