Jennie Garth knows a thing or two about feuding with her costars, so who better to assess a cast’s chemistry than the former Beverly Hills, 90210 star herself? During an interview with Tori Spelling on Tuesday’s Just Jenny show on Sirius XM, the 42-year-old actress was asked who she would like to see guest star on her new ABC Family series Mystery Girls and in the midst of answering the question, she ended up dissing the cast of the 90210 reboot. Garth said “That’s an example of a cast that really didn’t have that chemistry. It’s like lightning in a bottle, you either have it or you don’t.”