I have so much to say about this and I'm surprised it's taken this long to be brought up.
When I first read the headline, I thought they were referring to the actress playing "Keeley" (Juno Temple) and I thought, what a downgrade she is to Olivia. Then I realized it was the lass Jamie Tart brought to the ball and thought - I could see that. As I told The Brand when we watched that episode, Bex is way hotter than Keeley, Jamie should do that. The Brand did not agree. I'm gonna run this new fling past her and see her reaction...also, how many times can Jason over-achieve? I still hate him. Oh, and she is hardly a co-"star" - what was she in, two episodes?
Obviously Olivia is over correcting for her mistake with Jason with this Harry Styles guy and that has no staying power. Two wrongs don't make a right, Olivia. But, you should know the half-your-age-plus-7 corollary does not apply to women. This is called the Mrs Robinson Exception, and we're talking Cougar Town now. Totally acceptable.