Episode: 4x04 (Season 4 Episode 04) Name: Can't Stop This Thing We've Started Originally Aired: Oct. 18, 2006 Plot: While rumors that Brooke is pregnant spread around Tree Hill High as well as the town, Peyton is able to get hip-hop artist Lupe Fiasco to perform at TRIC. Nathan, still recovering from the car accident, buys a motorcycle despite Haley urging him not to. Meanwhile, Lucas fights with Derek; Deb double-crosses Karen; and Rachel poses for Maxim magazine.