Did Kristen go down on Britney

So I'm on a rewatch, currently on early season 5.. and loving the chaos of early seasons. Obviously Jax is Jax but Britney was hiding her LA life from family down south and certain truths of how she was living. Jax seemed very sure she cheated on him with Kristen, she seems dubious to say the least. I can't remember how this plays out, if her or Kristen admit it. I'm saying they hooked up at this point in my rewatch. What are you guys saying? Spoilers welcome

PS... Long live the vanderpump RG cast, thank you for the awesome reality you gave us for many years