My soon to be ex has been bringing a new girl around my daughter: Advice?

My soon to be ex-husband has just brought a new girlfriend into our daughter’s life about three months ago I had to find out from our four year old daughter that he was seeing someone else, and now she’s over all the time doing her hair and seeing both of them (I don’t know if I’m in the wrong to be bothered since he sees our daughter every weekend) but every time she comes home she has a new hairdo done by his new girlfriend I still don’t know who this woman is and she has a daughter of her own I don’t know if I’m overreacting or not but it bugs me cuz when he does pick her up it’s 1 pm/1:30pm in the afternoon on Saturday, and now he’s pissy that I’ve asked him to pick her up early Saturday morning or Friday night