Erika Jayne is ready to hit the stage. Whether the “Real Housewives of Beverly Hills” star is rehearsing for her Los Vegas residency or reprising her role as Roxie Hart in Broadway’s “Chicago” on Jan. 20, getting performance-ready works up a sweat, and with that, she says, her weight fluctuates.

G rowing up with a mother who is practically a kid herself isn't easy, and Erika Jayne never hid the fact that her relationship with her mother is... complicated, to say the least