One Tree Hill star Jana Kramer has opened up about the sometimes-tense atmosphere behind the scenes on the show, revealing that one unnamed person "made it hell" for others on set. Speaking on the latest episode of the podcast she hosts with her husband Michael Caussin, Whine Down with Jana Kramer and Michael Caussin, Kramer revealed ahead of a reunion chat with her One Tree Hill co-stars James Lafferty and Stephen Colletti that they hadn't always had a chance to be so close.