JoJo Siwa’s brouhaha with Candace Cameron Bure may have started a whole trend of celebrities holding other famous faces accountable for past rude behavior. Spencer Pratt, one of the stars of MTV’s The Hills, is the latest to call out a seemingly unlikely candidate for “rudest celebrity,” as he put “Phoebe from Friends” — aka Lisa Kudrow — on blast for an interaction he and wife Heidi Montag supposedly had with the actress at a party in 2009.